We got 3 pieces now, and they worked all well.
But now after transport&network change one won't work anymore, it is looping at "tunning".
Sometime later it just restart also.
Here are some logs:
...
Jan 28 15:58:18 InnoMiner kernel: nand: WARNING: pl35x-nand: the ECC used on your system is too weak compared to the one required by the NAND chip
Jan 28 15:58:18 InnoMiner kernel: Bad block table found at page 131008, version 0x01
Jan 28 15:58:18 InnoMiner kernel: Bad block table found at page 130944, version 0x01
...
I don't know the first thing about these miners, but these lines stuck out to me. Maybe check the startup logs from your working units to see if they report something similar.