I was experiencing crashing on Sky Temple for a long while, and had switched my shader setting down to medium which prevented the crashes/kernel panics.
All was stable again, for a while… 
Though now, I’ve started to crash on what seems like arbitrary maps. But the crashes also aren’t the exact same as before, where it seemed like hots executable was crashing. Now it seems like my eGPU ejects itself - laptop says on, external monitors go black and hots crashes.
This could be purely a bug in macOS or the eGPU, though I’ve only experienced it while playing hots. And I’ve now experienced it like 5+ times. Also it seems likely to reoccur when I try and rejoin a game which it happened in previously.
I have some stack traces that maybe useful but they are over the paste-bin / alternative upload size. So I hand them over if blizzard have a email or something I can send them to.