Tittle says it all.
Few Hours ago the rig went down and Wathdog did not reboot.
GPU2 fans were not spinning.
Did a manual Reboot, via Reset Button after trying through HiveOS Webinterface.
Logged into console, watched Phoenixminer start just to crash a few seconds later.
Replaced the Riser for GPU2.
Miner crashed again.
Unpluged all GPU’s except GPU0
Phonixminer starts, runs for a few minutes then crashes / restarts.
Testing ethminer now for over 12m without a crash.