Hi. I need some advice. My iPhone (3G 2.1) is acting weird. Everytime I run an application, after a few minutes of using it, it automatically quits and goes back to the home screen. It happens very often with Safari and many applications downloaded from the AppStore. I tried restoring it but this didn't work. I am considering taking it to an Apple store but there is one problem - I had previously jailbroken my iPhone and although it is now restored back to normal, I am worried that they might find out somehow and void my warranty. Atleast that's what I've heard. Any suggestions? Please let me know how it works. Thanks.