Intermittent screen (slight) 'flicker' after awake from sleep, anyone else?

My new Acer 38" Ultrawide (xr382cqk) shows a mild flicker when waking from sleep.  It's just barely noticeable but enough to be annoying and I'm worried about eye strain.
I considered it could be the monitor, but my previous Acer 34" Ultrawide (xr342ck) never flickered like this.


I have dual Fury X cards with the 38" 3860x1600 as primary and a Dell 1080p monitor as secondary.
I just turned the 38" off (waited...) and back on and the flicker seems to have disappeared.


I'm still curious if this could be a driver issue because my previous monitor didn't show this behavior.