I have tried to find a thread that would apply to my phone, but to no avail. My HTC EVO version 2.3.5 seems to be turning itself on. My phone was low on battery so I plugged it in to charge and turned it off. A minute later I heard the phone turning itself on! I left it alone and it did it again. This time I didn't turn it off! Not sure if it was automatically updating something, but I think that the phone tells you there is a new version update available and asks if I want to update it. I know it turns itself after updating and then turns itself back on. The second time was even weirder.