Hello. I've bought used iphone 3G recently and I'm having weird problem with the touchscreen. When it's locked for some time it won't get unlocked, because touchscreen doesn't respond to slides/swipes/touchs/etc. but if I press lock button (one on the top of the device) twice (lock->unlock) then I'm able to unlock it by sliding finger - like it should work.
Sometimes touchscreen becomes unresponsive in device active (not locked) state, cure is the same - lock->unlock.
As I can tell it is not firmware related, I've installed 2.0.2, 2.2.1 and 3.0 b3 firmwares on it (actually latter is the reason I can't return the iphone to the previous owner - it was locked version, so because of baseband version 04.24.02 it can't be unlocked to local operators, so phone functions don't work) now there is 2.2.1 jailbreak installed (jailbreaking was done using quickpwn 2.5).
Can anyone help me? Thanks in advance.