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Cpu / rear hub

My wireless CPU loses communication with the rear hub about 30/40 min into a ride. This happened yesterday. I stopped took the battery out of the CPU and put it back in then fired it up again, still no communication.

The CPU went to sleep and I motored on and about 5 hours into the ride I turned the CPU on again and it worked. It worked for 30 min then lost communication once again.

Any body have an idea as to fix this/?

Thx D

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