it continue to crash after few minutes or half hour of mining.. and to restart it I can only reboot the RIG. It isn't very nice to use this miner in this conditions, totally unstable.
Then, while it works, 4 gpu works slower, sometime the last one stop to work.
If not fixed, i am going to switch to another miner because I can't check my rig every 10 minutes crossfingering that everything is working fine.. totally waste of time and energy