Did the lower court have the obligation to correct an illegal sentence, brought to its attention, regardless of the passage of time?

QUESTION(S) PRESENTED ; ; 1. Did the lower court have the obligation to correct an illegal sentence, brought to its attention, regardless of the passage of time? 2. Did the lower court fail in its duty to correct an illegal sentence, subject to plain error review, during defendant's direct appeal, even though defense . ¢ counsel failed to challenge such? 3. Did the lower court abuse its discretion by not intervening when Petitioner raised serious issues regarding defense counsel's representation, including ; his failure to challenge a clearly illegal sentence? 4. Should a defendant, who did everything in his power as a pro se inmate litigant, be time barred from raising : clearly unconstitutional and illegal violation, including an illegai sentence, when ali of the delays _ were caused by the failures of his court appointed attorney? : iv