I've got a cheap android tablet running Android 4.0.4 and it doesn't seem to be "waking" up when I want it to. So, when it shuts off after period of inactivity or when I put it to sleep (not powering it off, though), it won't "wake up" at a specified time via the built-in alarm clock or another app (like tune-in which has an alarm feature built into it). When I manually "wake it up" by pressing the power switch, the alarm that should have gone off before goes off after a few seconds.
Do I just have something disabled that is preventing it from waking up? Or is this possibly a hardware issue?