for me 11.1 is more stable version. on 11.2 i get crash evry 10 min...
I also had same problems, not every 10 minutes but crashed twice in 24 hours. I'm mining with 8 gpu since 4 months and never had a single crash with previous Claymore versions, something wrong with 11.2
On my Linux miners, the migration to v11.2 reduced performance. All was tuned automatically to optimise hashrate and consumption, especially the ETHI/DCRI... finally after reoptimizing, changing memfreq and intensities, it was faster and consuming less... If GPU are unstable, it may be because cards are near instability and were pushed too far with new algorithm. Review the frequencies and intensities...