My Note 20 Ultra 5G started acting up just the other day. My wife who has an S21 Ultra had hers stop charging a couple of days before mine. I remember Samsung sent out an update once before that disabled charging with 3rd party chargers and those that didn't meet certain specs back around the time of the Note 7 debacle. It makes me wonder if they've done something similar recently. It's too coincidental that both of our devices exhibited the same behavior within days of each other and our devices are very different. We've been using the same kind of wireless charger for years without issue. The only thing I found that works is the Samsung USB 2.0 wall adapter that came with my phone.
