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Specialized power cranks

Hello guys, I bought a brand new specialized powermeter (power crank specialized). During rides suddenly the edge 820 looses connection from the power meter and the power goes to zero watt for seconds sometimes for minutes, the edge lost signal. I did several tries calibration, new pairing and resetting the power meter. What's the issue? Calibration is always good. I don't know if it depends on edge 820 or specialized power meter.