Try notching back the overclocks to see if it becomes more stable. XIV isn't optimized very well and strains every subsystem at once--many of those other games likely do a much better job distributing work across the GPU and additional CPU cores and likely don't thrash the drive and RAM as bad either.

You guys may not have pushed clocks up or trimmed RAM timings yourself, but the higher performance level hardware you have will be configured to run faster clocks then the reference designs...so they are in fact over clocked compared to the typical specs in play. We've seen such configurations do weird things in the past like this and notching things back slightly often improves stability.