I actually sent the unit back to them to be checked out. We found nothing. Gold connectors on shielded cables were installed, and multiple antennas. Still no improvement. The categories that failed were BAlt, and Mode 3A, and sometimes SIL, SDA, NACp, NACv, Flight ID, Emit Cat, and Mode 3AKen
Then there was something really wrong with your installation or equipment. I have not seen a single failure when installed correctly. I did see failure when some customers broke the ADSB antenna while trying to trailer the gyro loading it up and down from a trailer. Then they never paid attention to check antenna was there solidly in pre-flight and went and flew it. EchoUAT burnt out because of that because the power cannot be dissipated. Then it failed every time. So if the antenna is broken or not properly connected (bad RG400 cable connection) then it will burn out and fail and you have to send it back to get the board changed and fixed.