I have one camera (and early XT) that does the same thing. Periodically it will just fire off alerts continually - for no apparent reason - and then stop sometime later.
It’s definitely this one camera, not it’s location. I swapped it’s place with others on my system and it didn’t help. Nor did putting in new batteries, nor deleting/re-adding it to my system.
I’ve contacted Blink support and they’ve suggested all the stuff I already tried. After I repeated all of the tests and told them it didn’t work, they didn’t come up with anything new.