What is your setting here in DJI Pilot App? Sometime, when there are too many interferences I used to lock one channel manually (far from noisy frequence) in order to keep the signal stable. Other times I leave it auto. I usually keep the bird hoovering in front of me half a minute or more to verify that all is ok before fly, during this check sometime I loose the signal for one or two times and then all ok. Maybe, during this operation the system try to switch channels in order to find the best. Bye and greetings from Italy!