On yesterday's mtb activity, my garmin edge 820 continuously signaled connection / disconnection of the garmin speed sensor (PN 010-12103-00). After several connections and disconnections, the edge 820 was shutdown and restarted itself. This happened a couple of times.
In order to continue with the course, I disconnected the speed sensor. At the end of the course, I changed the battery and the sensor was again detected normally without edge 820 going out.
Edge 820 firmware version 11.20.
Is this the Edge 820 normal behaviour when any sensor has low battery level?