I was asked a few times if I would post a “how to” install video for afterburners, this is the old Truefire kit from 5280 RC, the newer updated controllers work even better, get yours here: fiftytwoeightyrc.com/
It doesn’t always happen but it has happened to me and the reason I think is because it causes a voltage spike for a split second and can cause the gyro to reverse its settings, when I power the plane first then the AB controller it’s fine, I know it’s weird but it’s a thing