I found critical bug with rejected shares (about 1%), you can see them sometimes. Fixing it, I will re-upload v11.2 within an hour.
Yeah I'm having the same problem as the original poster 11.1 works fine but 11.2 gives me a few more MH/s but causes GPU's to crash in the first 10-20 minutes.
I can keep them up only if I dial back the OC settings which defeats the purpose. I'm back on 11.1 again.