@isazi yes, the watch was updated (I think last week) and I experienced it again during the last rides with the newest firmware. If it helps, I can provide the data.
I logged three rides,
Dropout during resupply (supermarket) approx. 8h into the ride. Reported 0W for the rest
Ferry approx. 1h into the ride. Approx 10 minutes waiting time and 10 minutes on the ferry. I was close to the bike the whole time but the powermeter disconnected.
Same scenario as 1.)
If I remember correctly, during the first ride with the newest firmware, the power was recorded for the full ride despite a supermarket stop. This was the shortest (<5 minutes) but I went definitely out of range of the Bluetooth signal.
As I said, if I can do anything to help you fix the issue please don’t hesitate to ask.