Problem with RB951G 2HnD

Hi, I have just purchased a RB951G, updated it to 6.2. Loaded a config to make it work with ftth, and works, but suddenly the router restart or just drop ethernet connection, the leds go all off, or all leds switch on.

I have reset to factory settings just in case, and do nothing except set logs to disk, works perfect till it restart and stucks, I can log with wifi connection and see all the config, but when try to change anything, all turns off and I can only turn off the router.

Any advice or is just a hardware problem?
log.0.txt (50 KB)

6.2 is buggy, use 6.1 or 6.3 when it comes out.