I would be very surprised if getting a replacement device does solve it, permanently. They've never shown a reluctance, in my long experience with them, to go over-the-top in making customers happy. The fact that someone else on the board got a new iPhone 12 with the problem we're experiencing is evidence of this.
We have six Qi charging stands and pads throughout the house, which our two iPhone 12 Pros are placed on/in depending on where either of us is working or sitting, and the outages are completely random - no more likely on the Magqi Qi-enabled battery pack that's beside me now, than on the Anker stand I use bedside, or the HP one in the den-office, that I bought when I tried out their Elite X3 Windows phone a few years ago. Or, any of the others in different spots we sit, sleep or recreate.
I'm no engineer, but my suspicion is it's in the iOS or firmware, somewhere. We used iPhone X for the previous two years, and never had a hiccup.