The tablet receives information via the connected USB cord that is plugged into the RC. The signal comes through the antennas, so a tablet cover would not affect the signal unless it somehow blocked the antennas.
Ok thanks for explaining, I left the tablet cover on for the first time yesterday and both batteries I flew was pretty much a constant “weak signal” pop-up, and just thought they were tied together
Shouldn't make a difference, but you could try removing the cover again and fly in that same area. I'm suspecting there is something about where you are flying. And make sure the flat sides of the antennas are facing the Phantom. Don't point the antenna tips at it.