Can you check if there is anything untowards at the end of your dmesg
output when this manifests?

Anything like:

[22892.778103] [drm:i915_gem_object_bind_to_gtt] *ERROR* GTT full, but
LRU list empty

or similar complaints about drm, i915 or gem in general?

-- 
[GM45] with EXA compiz animations cause temporary freezes
https://bugs.launchpad.net/bugs/320813
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