It was with crossfire disabled in CCC. I removed the second card completely, tested for two hours and it did not drop, tested for another two hours and it dropped. It happens almost guaranteed within 6 hours. So it's 100% not related to crossfire and I'm glad I tested it as my cards needed a good clean out.
Perhaps it's something specific to my PC. The only major difference to most other setups is that I have 3 120Hz screens, my usual resolution is something like 4890x980 (can find that out for sure). The center LCD connects to the first HDMI port on the first card and the other two connect via two active adapters to the mDPs on the first card. Am not sure it relates to any of this though as it happened when I was using a standard 1980x1080 resolution too.
Am happy to test to help resolve the issue.
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