Flyingcircles- I;ve had that "banding" issue, i'm using the K-1 also.
I thought it had something to do with my cable -shield to RC, & a switch to another cord fixed it , but, it happened again yesterday, for a few minutes, at furthest waypoints,
I thought cause was the distance from bird to RC, but, it kept up as i brought her back home too.
Interested to see if anyone has any thoughts on this too
I had the Nexus 7 2012 2nd gen when I went through my troubles. I later bought the nVidia k1 shield when the GO app had grown by adding more processes and the tablet could no longer keep up. Btw, since that time the GO app developers remove or add processes. So there are times when some tablets work, and other times they may not.
You should at least do the test I mentioned and look for interference while moving the aircraft around when recording.
Wondering if it may be the SD card in the K1? That is if you have your K1 set to use the card as internal memory.
I recently went through this same issue and discussed it with DJI. They offered a terrific response. The Nvidia Shield K1 tablet is not on the approved list." Very helpful. I still don't have the answer but I hate to give up on my K1.