It has been... Sometimes it comes out and back in on its own

Do you have any other expansion module, even not connected?
I wanted to see if you could try a different USB cable. A shorter one to see if we can minimize the interference.
If not, PM me your address and I'll ship you one.

The only other thing I have is a wifi module for the older version standard or plus models

PM your shipping address. Let me send you one shorter one to test.

The replacement head unit has been running a couple days now and so far working great. No buslocks or network issues at all.