[jhautz]

Yes you have a bad connection on that motor connector. The fact that it works perfectly when you hold the connector together prooves it. You can resolder the connections without voiding the waranty. I repalced my connectors with 5.5mm bullets and when I retuned it for waranty I just cut them off and returned it with no connectors and they didnt say anything.

I looks like it is for sure a bad connection. If reslodering it doesnt work, then try replacing the connector all together on both sides. The motor and the controller side. If that doesnt fix it you can always just direct sloder the wires together and then shink wrap the connection as long as you are not moving the system around to different vehicles this is actually the bast way. If you direct solder on connection do them all. Its best to have them all the same.