2021 with Intermittent AC Cooling Issues

[tjonesdfw]

5.3 Sierra with approximately 80,000 miles had a radiator replacement about 6 months ago which required pulling the AC condenser and a vacuum and recharge on the system.  AC cooled fine until about a month ago, when it would suddenly start blowing lukewarm air for 5 minutes at a time at various points throughout the day, then suddenly resume cooling again.  Sometimes its when stopped at an intersection and other times while moving.  I've read about the internal electronics in the compressor going bad on these trucks and not cycling properly, but sounds like many dealers just chase AC issues with a parts cannon.  Also wondering if they charged it correctly when the radiator was replaced.   Is there an easy way to see if these electronically driven compressors are engaging properly, or to check for freeze up, etc.?  Dealer usually wont do much unless they can replicate or I can show them a video of what's going on.