Occasional "GPU is not responding". Overclocking, risers, or MB?

I have 14 x 5700 overclocked and bios modded in asus b250 mining expert.

I have occasionally (few times per day) rig restarts and log says “GPU x not responding”. Any idea why this behaviour? other than that my rig is rock stable with 99.88% correct shares

I have similar issue, out of 5 gpus, GPU 3 always drops hashrate to 0 and the rig restarts. I have dropped OC on this card and cant figure out what the issue is.

Spec:

Motherboard: MSI Z170A-G45
CPU: Intel i3 6100T
GPU: 5x Sapphire Nitro 5700 XT
RAM: 2x Corsair 4GB
PSU: AX1200i
Risers: Ver009

i have same issue my rig was working fine for week but now 1 hour than gpu drop 0 and restart
Thread(s) not responding. Restarting.

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Mine was crashing every 30m to 1 hour in v157 HiveOS with phoenixminer, but now I run lolminer and it is rock solid. No more GPU randomly not responding issues.

See screenshot:

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Seems like PhoenixMiner 5.2d crashes on my 14 card rig approx. every 8 hours. Whereas 5.1c only crashes every 2-3 days. Hmm. We take what we can get. Both seem to be crashing for the same reason (Stuck GPU). Maybe its a riser thing? Maybe? Seems like some cards like version 7 whereas others only work with 6c. But more often than not its a card using a 6c riser that crashes.