I found c8 to run much better and be more stable compared to c8.5.
I never had the crash issues I have now in 8.5.
Affer uninstalling eucon I still have same issues. According to Steinberg this time is because of openGl gui plugs. But it happened even if my Cpu is at 60/70%. Moreover projects working fine in c8 now crash in c8.5.