[Pault]

Sounds like it was just a bad radio. I don't think that you need to do anything more.

Just to be safe, however, one thing that I noticed you didn't include on your list is strain relief on all your wires. One of the things I really dislike about the current control system is how all critical power goes through those finicky weid-muller connectors. If you just zip tie down the wires near the connectors such that someone tugging on it further down the line doesn't put any strain on the connection itself, you will have a much more reliable system. Also definitely do this on barrel connector for the radio itself. Those things were designed to come out easily.