Help Needed ! APM 2.0 lose connection within first 10 sec. telemetry over network through udp


I am using 2.0.28rc1 version (haven’t tried any other versions). I have telemetry coming over UDP. QGC and mission planner detects and stay connected but APm planner 2.0 when opened will detect the telemetry and will loose the connection in first 10 second. The top right button still shows connected but data won’t update.

On flight path tab, operations timed out. Refreshing doesn’t help.

Also I noticed, it stopped my telemetry udp server somehow. I have to go back and restart it. Then it will detect the data but will soon stop.

I am no able to figure out why. Can you help plz?