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Have you tightened the 2mm Allen bolt that holds the battery holder/contacts in place? You have to remove the battery to access it, but mine stopped working and some research suggested this might be the problem, although I didn't have the calibration issues but this is usually a symptom, and once I did this everything started working again. It seems it can loosen from vibration over time.
The calibration numbers on Quarq Dzero gxp have suddenly jumped up by 100x and it is now failing to send power data. Has this happened to anyone before? I've followed the troubleshooting reboot advice but it hasn't fixed it.
I'm expecting it is has died an early death, it's out of warranty but is there a repair service?