I bought s2 one months ago....occasionally when I want to unlock the screen by pressing home button and power button...no response...after about 10 seconds the screen appear but when I swipe also no response..then the screen go dark again...I try a few times...but after about 10 minute..it backs to normal...this problem rarely occur...sometimes 3 weeks also not occur and it is working fine...

then got one screen auto rotation problem....the accelerometer ball do not move..it get stuck..and the reading of x,y and z axis do not change when I tilt the phone...it happen with no reason..but after a while it backs to normal...but sometimes I power off then turned on...it backs to normal....this problem also rarely occur...not frequent,,but most of the time it is fine...anyone can give the opinion to solve the problem..thanks

New thread up, so sorry guys. Just got back from Japan half an hour ago.