delivered the opinion of the court:
Defendant, Juan Falcon, was charged by indictment with three counts of aggravated criminal sexual assault and three counts of aggravated criminal sexual abuse. Following a jury trial, he was found guilty of all counts and the abuse convictions were merged by the trial court with the assault convictions. Subsequently, defendant was sentenced to three terms of 25 years’ imprisonment in the Illinois Department of Corrections. The 25-year terms were ordered to run consecutively pursuant to the mandatory sentencing provisions of section 5 — 8—4(a) of the Unified Code of Corrections. 730 ILCS 5/5— 8 — 4(a) (West 1996) (hereinafter, we refer to the Unified Code of Corrections as "the Code”). Defendant now appeals both his conviction and sentence.
On appeal, defendant raises five issues for our review: (1) whether the trial court improperly allowed the admission of so-called "other crimes” evidence; (2) whether the evidence produced at trial was sufficient to support his convictions; (3) whether his trial counsel was so ineffective as to deprive him of his fundamental right to due process; (4) whether mandatory consecutive sentences pursuant to the provisions of section 5 — 8—4(a) of the Code were improper; and (5) whether his combined sentence of 75 years’ imprisonment is excessive. For the following reasons, we affirm defendant’s convictions, but remand the case for resentencing. Consistent with Illinois Supreme Court Rule 23 (166 Ill. 2d R. 23), we publish our judgment in the form of an opinion only with regard to defendant’s sentencing issues.
Although defendant has raised the issue of sentencing on appeal, wé note that defendant has failed to file a posttrial motion challenging his sentence in the trial court. The State argues that this omission constitutes a waiver of any challenge defendant may now wish to bring concerning his sentencing. For support, the State relies upon the amended terms of section 5 — 8—1(c) of the Unified Code of Corrections (730 ILCS 5/5 — 8—1(c) (West 1996)), which provides that a defendant "shall” file a postsentencing motion if he wishes to preserve sentencing issues for further appeal. According to the State, our supreme court’s decision in People v. Lewis, 158 Ill. 2d 386, 634 N.E.2d 717 (1994), which held that the failure to file a postsentencing motion does not result in waiver, is no longer controlling, following the General Assembly’s amendment to section 5 — 8—1(c).
*541We reject the State’s waiver argument, as have the better reasoned appellate decisions to consider the issue. See, e.g., People v. Williams, 285 Ill. App. 3d 394, 673 N.E.2d 1169 (1996); People v. Porter, 285 Ill. App. 3d 50, 52, 676 N.E.2d 1 (1996); People v. Cook, 279 Ill. App. 3d 718, 726, 665 N.E.2d 299 (1995). But see People v. Rogers, 286 Ill. App. 3d 825, 677 N.E.2d 13 (1997); People v. Reed, 282 Ill. App. 3d 278, 280, 668 N.E.2d 51 (1996); People v. McCleary, 278 Ill. App. 3d 498, 501, 663 N.E.2d 22 (1996); People v. Moncrief, 276 Ill. App. 3d 533, 541, 659 N.E.2d 106 (1995). Even were we to accept the State’s waiver argument, however, we note that even those cases relied upon by the State have acknowledged that whether a defendant’s sentence is properly imposed is generally a question that concerns the defendant’s fundamental constitutional right to liberty. As such, even if waiver were to apply, we would address defendant’s sentencing arguments under our plain error doctrine. See People v. Ritchey, 286 Ill. App. 3d 848, 677 N.E.2d 973 (1997); Reed, 282 Ill. App. 3d at 281; McCleary, 278 Ill. App. 3d at 501-02; Moncrief, 276 Ill. App. 3d at 535.
Defendant first argues that his consecutive sentences, which the trial court indicated were mandatory under the terms of section 5 — 8—4(a) of the Code, were not proper under that section. This section provides for mandatory consecutive sentencing for each offense of aggravated criminal sexual assault when a defendant: (1) commits the assault in connection with other criminal acts, (2) those other acts also resulted in convictions for which defendant is being sentenced, and (3) when all the acts are together part of a "single course of conduct during which there was no substantial change in the nature of the criminal objective.” Consecutive sentences are not appropriate under the terms of the statute unless the defendant’s convictions meet these requirements. See generally People v. Williams, 263 Ill. App. 3d 1098, 638 N.E.2d 207 (1994).
Defendant notes that the indictments under which he was charged did not indicate, either expressly or impliedly, that his criminal acts were committed as part of a "single course of conduct.” Indeed, our examination of the indictments shows the State failed to allege defendant’s crimes occurred at any specific point in time whatsoever. Rather, the indictments merely state that defendant molested J.M. in three different ways over a period of several months.
J.M. testified that defendant sometimes inserted his finger into J.M.’s anus before engaging him in either oral or anal sex, but J.M.’s testimony did not indicate this was always the case. J.M.’s testimony appears to indicate that, sometimes, defendant simply had oral sex with J.M.; other times, defendant simply had anal sex. During clos*542ing argument the prosecutor stated that the evidence established each of the allegations in the indictments by proving defendant molested J.M. in the following ways: (1) penetration by defendant’s finger into J.M.’s anus, (2) penetration by defendant’s penis into J.M.’s mouth, and (3) penetration by defendant’s penis into J.M.’s anus.
At oral argument before this court, the State recognized the lack of evidence indicating precisely when and how often defendant molested J.M. Moreover, although the evidence established that defendant committed more than eight acts of criminal sexual assault against J.M., the evidence was clear that no more than two of these acts occurred during any "single course of conduct.” See People v. Bole, 155 Ill. 2d 188, 194, 613 N.E.2d 740 (1993) (sexual assault offenses were not committed as part of single course of conduct when committed on different days with substantial interruptions of time between them). The trial court’s decision to sentence defendant to three consecutive terms was therefore conceded by the State to be error. The State agreed with defendant’s counsel that, if we reject the State’s waiver argument, the case must be remanded for resentencing.
The question remains, however, as to whether, on remand, the trial court may find that two of the defendant’s criminal acts were committed as part of a single course of conduct, so as to require two of defendant’s sentences to be served consecutively pursuant to the mandatory consecutive sentencing provisions of section 5 — 8—4(a).
Defendant points out that it is impossible to tell from the record which of the eight or more assaults J.M. testified occurred constituted the basis for the jury’s three convictions. Although he concedes it is possible the jury convicted him for committing two acts of aggravated criminal sexual assault during one course of conduct and a third act during another, it is also equally possible that the jury convicted him for committing three separate and distinct offenses on different days, each of which constituted its own "single course of conduct.” If defendant’s convictions were for crimes that were independent acts, mandatory consecutive sentences are improper.
The State’s position at oral argument before this court was unclear with regard to the possibility of mandatory sentencing on remand. There was a suggestion that the State may argue on remand that mandatory consecutive sentences for two of defendant’s three convictions is required under section 5 — 8—4(a) in light of the testimony that defendant committed two acts of penetration against J.M. during several of the occurrences. Because the issue must be resolved for defendant to be properly sentenced on remand, we elect *543to address the question now rather than risk the prospect that defendant might receive a second improper sentence.
Since our supreme court first addressed the issue of the meaning of "single course of conduct” in Bole, appellate courts have not developed a consistent or even coherent analysis of when courses of conduct are "related,” as opposed to "separate.” People v. Strickland, 283 Ill. App. 3d 319, 324-25, 668 N.E.2d 1201 (1996). It is clear, however, that when a defendant commits multiple acts of sexual assault separated by a substantial passage of time between the assaults, the assaults are treated as being "separate,” and not part of a "single course of conduct” for purposes of section 5 — 8—4. Bole, 155 Ill. 2d at 194.
Thus, in People v. Pence, 267 Ill. App. 3d 461, 641 N.E.2d 933 (1994), defendant was convicted of two counts of aggravated criminal sexual assault for which he was sentenced to two mandatory consecutive terms pursuant to the provisions of section 5 — 8—4(a). The appellate court noted in reviewing defendant’s sentencing that the jury had been presented with evidence that the defendant assaulted the victim on more than five occasions, but the indictments stated only that multiple assaults had occurred over a six-month period of time. The court vacated the defendant’s sentences and remanded the case for resentencing, stating: "[Although there was evidence from which the jury could have concluded that two of the offenses were part of a single course of conduct, the language of the charging document, the evidence at trial, and the general verdict of the jury do not permit the 'single course of conduct’ conclusion required by Bole for mandatory consecutive sentencing.” (Emphasis omitted.) Pence, 267 Ill. App. 3d at 466.
Here, as in Pence, the State never established how defendant’s three convictions related to any given "single course of conduct.” Thus, as defendant argues, it is impossible” to determine whether the defendant was convicted by the jury of committing two acts of aggravated criminal sexual assault during a "single course of conduct,” or whether the jury’s three convictions related to entirely separate occurrences. Although it is possible that the jury convicted defendant of committing two offenses during a single course of conduct, the record is simply insufficient to establish that the jury did so. In such a situation, consistent with Pence, we find defendant may not be sentenced to mandatory consecutive sentences under the terms of section 5 — 8—4(a).
In addition to being consistent with this court’s prior holding in Pence and the supreme court’s decision in Bole, we note that our analysis comports with the general principle that any ambiguity in a *544criminal statute must be strictly construed in favor of the defendant. People v. Chandler, 129 Ill. 2d 233, 253-54, 543 N.E.2d 1290 (1989). " 'If a statute creating or increasing a penalty or punishment be capable of two constructions, undoubtedly that which operates in favor of the accused is to be adopted.’ ” People ex rel. Gibson v. Cannon, 65 Ill. 2d 366, 371, 357 N.E.2d 1180 (1976), quoting People v. Lund, 382 Ill. 213, 215-16, 46 N.E.2d 929 (1943). Interpreting section 5 — 8—4(a) in any other way on remand would have the effect of violating this hallmark of statutory construction.
Because the case must be remanded for resentencing, the question of whether defendant’s sentence is excessive is premature and we decline to address it.
For the forgoing reasons, the judgment of the circuit court of Cook County is affirmed but defendant’s sentences are vacated. The case is remanded to the circuit court for resentencing.
Affirmed in part; vacated in part and remanded.
GREIMAN, P.J., concurs.