I'm still not entirety sure how to resolve this as I still don't really understand what the issue is or why it's crashing, but reading your link this is likely to be an ongoing issue? I've done some searching, but I'm not sure how to build my own iso image. Im just using the generic OS from the libreelec download page.
I have a spare Nvidia gpu lying around, so I'll give that a go and see if that changes anything.
EDIT - Tried the nvidia GPU and still seems to crash :s Going to go try with GPU and VAAPI off and see if that makes any difference, then go back to IGP with VAAPI off if successful