I haven’t seen this happen as bad as your issues, thankfully. I have notice some dropouts when the batteries were low. After I changed to new batteries I have only seen maybe 3-5 dropouts on a 3-4 hour ride. It’s also my right pedal usually.
A few dropouts here and there don’t bother me and I feel have a decent sense of RPE for efforts so if NP is off a few watts it’s l only a few watts, IMO.
I’m interested to hear what happens for you guys and do you think I should reach out to garmin?