Glad you guys posted this info. I've been wrestling with this for a few months. My '19 Edge is at the dealer now. They told me Intelligent Access only works with the driver door, and I shut that down immediately.
Anyway, I thought it might be correlated with rain and moisture, but that didn't seem to match when it would start and stop working. The battery, however, is far more likely. I don't drive much anymore and have been away for >7 days twice in the last six weeks. I would have never thought about it being the car battery, so they are testing it now.