I also get the pause when cold effect. I live in Vegas where it's usually not even that cold in the mornings. Did it a few times last year and already a few times this year. Just had the flush done. Gonna give it a few days to see if it goes away. If still present I'll bring it in and ask about updates, etc...
I believe my random shutter is cured though. Least I didn't notice it on my last 150 mile round trip I took.
2018 silverado 1500 6.2 4x4 nht 6,800 miles