Comment # 2 on bug 1226232 from Takashi Iwai

Do you see any relevant kernel messages indicating crash or such?
It's difficult to diagnose without logs, unfortunately.

In anyway, try the kernel in OBS Kernel:SLE15-SP6 repo
  http://download.opensuse.org/repositories/Kernel:/SLE15-SP6/pool/

It's the build from the latest git branch, and some fixes might have been
already included.