I've had my iPhone 3GS for a little over a year, bought it RIGHT before the 4 came out (grrr!) and within the last month....it just shuts off whenever it wants to. It started when I noticed that the battery percentage was below 50% and whenever I used my Facebook app. NOW.....it does it whenever I open an app, send an email, on a phone call......WHENEVER IT FEELS LIKE IT! It is so aggravating. When I go to turn it back on, sometimes its instant and other time it can take 5 minutes to come back on. Another thing is...it will NOT turn off if it is on the charger. Im thinking about taking it to Apple but I know they are going to instruct me to get a new phone all together. PLEASE HELP!