Hello,
Anybody else has that problem? I don't know if it's related to v4.3.8 of Go4 or not.
Lately, at two different locations, I found that the communication range between the spark and the RC has been greatly reduced. At ~100 or so of distance it loses connection, the video freezes and becomes black and white, and eventually there is an alert for loss of connection and it prompts a return to home.
Also, I found that Spark drifts a lot more than it used to, although it's in GPS mode.
DJI Go4 4.3.8, latest firmwareon both Spark and RC, Samsung Galaxy Note 8 connected to RC via wifi.

Anybody else saw these phenomena lately?

All I can say is I always fly in FCC mode and thus far I’ve taken my spark 3321 meters one way the most
I just don’t fly in CE, I think it’s just plain dangerous!

Fly safely
Alex

Downgrade the app to 4.2.x, turn off video cache. Try again & see if it works.