If I had to venture a guess I would say they worked on the ground initially because it was a short time period. After a 7 minute flight or so the controller most likely over heated and failed. That's why you had problems after the flight. This is in no way and excuse. I have never been a fan of the JP brake ontrollers and very often switch to the xicoy lg15. I recently tried the AG68 anti slip controller and it seems legit but have only used it during a taxi test. Not an actual flight at this time.
Tone