I'm am a very new pilot, but I had a question about the settings in the Transmission tab of HD vs Smooth and learned that they refered to the video transmission between the controller and the aircraft.
As explained: "When the setting is in HD, the video feed to your phone is 1080p. If you happen to start to get a weak signal, you might notice that the image stutters a little. Changing this setting to Smooth will lower the video transmission to 720p which is easier for the drone to transmit to your phone, so this might "smooth out" the video feed to your phone. Neither will have any effect on the video recording to the SD card."
So on to your issue, have you tried the Smooth setting? Thinking that if your tablet/phone is a little under-powered this might help.