Would recommend flying in a familiar place and using video image as reference. If you are in relatively clear area with decent GPS coverage based on experience, then loss of control will result in automatic return home. However I have lost video, or had it lockup or distort and still had control of the aircraft. I usually manually activate return home at that point as orientation is tough when farther out.
Fly out until video starts acting flaky and compare. Don’t push it, no need to. Video takes more bandwidth than control so shows deteriorated signal first.
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