This noise issue is happened when pause/release HDMI playback, the possibility is less than 5% and there's no obvious error trace.
The recorded wav file is attached.
BTW, I tried to reproduce this issue with sine wav, but failed.
noise.zip

Kernel-topic/cros-sof-v4.14-rebase: a38231
DSP FW-origin/glk-004-drop-stable: 1f79920
Topology-origin/master: 5894ed

This issue is to follow up issue #349 fixed by #504