mine happen frequently when i just got it, about 2-3 times per week, sometime per day. after 2-3 month usage it didnt happen anymore.

however it can be turned on by pressing the on off button, only sometime need to remove the battery.

i read somewhere use setcpu and set processor to higher clock speed when idle, however the problem still there when i set mine higher last time.

This post has been edited by dvinez: Sep 6 2011, 03:40 PM

i think is software but weird it only happen to some SL, earlier Ace have this problem.

recently my wifi freeze/disconnected few seconds then connected again, and then disconnected in few seconds or minutes again. but phone doesnt know it disconnected though.