Happened once mid-ride - the speed suddenly went to 0 and distance stopped counting. Sensor menu showed speed2 sensor (via ant+) as still connected. Tried with watch in parallel and there speed was shown, so no sensor issue. HRM & Vector3, all via ant+ were working fine when this happened.
If sensor would have been missing/dropped 1040 would normally switch to GPS speed but this did not happen, looks like all speed/distance data from sensor was replaced with zeroes
Only full device reboot solved the issue.
edit: added connect screenshot
