I'm hitting the same thing.
LibreELEC build #0501
NUC- NUC5PGYHR
BIOS- PY0053 - 4/1/2016
I can only use box for 1-4 mins before it locks up. Strangely enough the SSH session is still active after KODI locks up so the box isn't hardlocked.
I've tried disabling all C States thinking it was related to this bug 88012 – [bisected BYT] complete freeze after: drm/i915/vlv: WA for Turbo and RC6 to work together but that did not help.