I finished with the repairing.
I think this problem exist because of the instability of the main board. There are 2 screws, wich hold the board, and when they were taut, the restart happend. And the only way when i detected this, when i moved the mainboard.
I dont know, how will i be able to fix this problem completely... Now i skipped a screw next to the jack-in, now it works better. maybe...
