Sometimes the time on my phone (X10 mini pro) is a little late while in sleep mode. I've experienced differences from 1 to 3 hours. My guess is that the clock system component (if there is such a thing in Android) doesn't get enough CPU time for some reason. This is not a big problem yet, since the clock will show the correct time just a few hundred milliseconds after I turn the screen on. The problem starts when I'm in sleep mode too and the phone is supposed to wake me up, because that way I have to wake up first to wake up my phone to wake me up.
So the question is: is there a way to force my phone's clock to always refresh it's time, even in sleep mode?
Update: I think I've found a pattern which might be relevant. Looks like this behaviour never occurs while charging the battery.