Chosen Solution
3g, had it for 2 years, started going nuts 2 months ago - turns off, resets itself, vibrates completely randomly, goes to the shut off screen (slide to power off or cancel) also randomly - its a bundle of joy, really :) has been dropped a few times but not in a very long while - taken to apple store, they tried to “repair” it but i dont think they even know where to start any advice? totally desperate!
Had same problem. Went to local independant repair man. He reseated the main board: voila, problem solved! JJ -the Netherlands
Try to get new logic board. -Me-