It all started when I got the C3 and got the comms collar with it. Nice concept and works well. Unless of course you do loads of miles and regularly take your helmet on and off. Out of warranty and it failed, it just wouldn't turn on. Schuberth say not repairable. I replaced it with another and all was well for another 30K miles and past the end of warranty. It was now having intermittent faults, it'd keep turning off. Soon after this the helmet was damaged in a fire so I became the owner of C3 Pro with comms. This is now showing the same faults and has been returned. Schuberth say 'no faults'. Getting pretty cheesed off with this I did some research and opened up one of the old ones to investigate. I've found the fault, the ribbon cable connecting the two circuit boards needed replacing. Job done, the old one is working like new again. I've done about 1500 miles in the last few weeks and given it a good shake down, no probs.
So, does anyone else have a failed comms unit they want to get working again? I may be able to help, or am I alone on this one.