This hasn't happened again since November 2020- had an unrelated service visit and a no start issue. Dealer found problem and repaired electrical fault under warranty. Coincidentally, no problem since... IDK. Winter just started. Will see if any problems arise this year.
2019 Denali Park assist intermittently gives multiple false alerts in very cold weather. It's even worse after washing. One day the Park Assist kept shutting down in spite of main setting menu being set "on". Dealer checked and said no problem- asked me if it displayed and error code .Service adviser was a bit impatient, said he wouldn't throw parts at the problem and told me to keep an eye on it. This answer gave me the impression he'd heard this before