This happened a few days ago, its a iphone 3G running 3.1.3 jailbreaked (2 months ago). The ringer goes up by itself to maximum volume! randomly a few times a day.. Also, the "Slide to turn off" menu appears without me pressing the power button (if im playing a game or scrolling trough the menu it pops out of nowhere). I tried a restore but it keeps happening.. Anyone experienced this?