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@hippy
I had my second and very much weirdest issue with Di2 during Transiberica. The whole lot appears to have 'crashed' at the top of Mont Caro at 4 in the morning and required a trip to a bike shop with me suspecting cable damage, only to find out everything was visible on the computer. Update firmware and everything starts working again - like a "reboot" fixed it. Proper odd. I've never upgraded firmware on any of my Di2 bikes. I wonder if it was something to do with the radio station stuff at the top of Mont Caro or just a random thing.
There's a few "bug fix" entries but who knows if one of those was the same thing.
https://bike.shimano.com/en-EU/e-tube/project/firmware.html