... I've experienced lag on video return not being far awat as 600m ... It happens several times for some seconds ...
I am trying to solve a similar or related mystery glitch with my (plain)
M3.
All flights within 300m (1000ft). I was standing at the edge of an open field, above which I was flying. I was recording to a 128 GB Samsung Evo card with a write speed of 30MB/s (more about that later).
Flight 1: Using Samsung Tab S7 as display. No SIM but WiFi connection to a portable cellular router in my pocket. I took photos and 4K 30fps videos. After about 10 minutes of videoing, the image on my tablet froze. I got the drone back by pressing RTH. When the drone was about to land, I canceled RTH and hand-grabbed the drone.
Flight 2: Same as above, except the Tab S7 was in flight mode and I filmed at 4K 60fps. Again, the video image froze after 10 minutes, and I regained the drone via RTH.
Flight 3: Same as flight 2, except I had bought a new phone (Xiaomi Mi 11 8/256GB), which I was using for display (no SIM, in flight mode). During this flight, I got a warning that there was a manned aircraft nearby (I was flying a few meters above ground), and another warning that there was RC interference. Again, the image froze after 10 minutes of videoing. This time I tried to retrieve the drone without RTH, but because the image was frozen, I wasn't sure about the drone's position relative to some power lines and posts.
Flight 4: Same as flight 3, except I was only taking still photos. 30+ minutes of flying and photographing without issues.
Observations:
1. During flight 3, I could see that while the camera view was frozen, there was some variation in the telemetry data (particularly height) when I tried to move the drone. Assuming that the drone sends the camera view and telemetry data in a combined video feed, the freezing of the camera view must take place in the drone, before the telemetry data is overlaid on it. This made me think that my old (and slow by today's standards) memory card may have something to do with the problem.
2. During flights 1 to 3, the freezing occurred after about 10 minutes of video recording.
3. The freezing took place when the drone was far away from me as was possible in this field (about 300m).
Regards, Antero