Man, that’s rough — three controller failures in such a short time is beyond frustrating. Sounds like you might’ve gotten caught in a bad batch from Inokim, especially if both the original and the replacement had the same issue. No one wants to spend more time mailing scooters back and forth than actually riding them.
Hopefully the Vsett 10+ upgrade next year brings some peace of mind. In the meantime, I’ve found taking a break with something like the Getting Over It mod helps me chill when tech lets me down. It’s just as infuriating in its own way, but kind of therapeutic too.