I have a Samsung Galaxy S3(GT-19300) which is about a year old now.Since past two days, i am experiencing a problem.My phone would switch off on its own and then the Samsung logo would start flashing on the screen.I guess it has something to do with the power key as most of time it happens when i try to lock the screen.I have already tried 'wipe cache partition' and have formatted my sd card but to no avail.Also,i have not installed any new app recently.
looking for suggestions