Err: RADIO-2 problem

Hello. Something is wrong with my pixhawk and Orange RX LRS receiver. For arround 1 second all chcanels values going to 0 then back to original value. I checked my log and found “Err: RADIO-2” error code. What does it mean? I’m using PPM-SUM.

Please check video:

The errors are listed here … _Failsafes

and it means that you did not get a signal from your receiver for 2 seconds