There are several threads about this both here and on the DJI forum. I don't think it has to do with the cables or the SD card. I'd have to agree with the people who theorize that this is a signal issue. For me, turning wifi off on my tablet helps a LITTLE (lowers the probability, does not eliminate the issue). Flying in an area with a lower density of wifi routers helps (if I fly around my neighborhood, with a lot of houses close together it is 100% guaranteed to disconnect). The only thing that resolves this for me, at least temporarily, is to land and reboot the controller. Also, I NEVER got this issue with the old firmware and the old Android app.
If this was indeed changed because of a restriction of channels in the last firmware update, I hope it is something DJI can work through in a future update. This cripples Lightbridge and really makes me scared to fly with FPV instead of strictly LOS. Once the disconnection issues start I am at the mercy of RTH and then LOS for my landing.