I understand what you are saying Nick. I figured I would start there since that is the error message the unit is showing. I would get in the unit and see if there was anything obvious before proceeding, just trying to see if there are parts out there to fix it if needed. This is all part of my research to see if it is worth the gamble.
There is another unit out there that seems to need a software restart on occasion that also has me interested. Not sure what to make of that one, maybe heat related, or power drift? I just wish there was a way to turn my 4000B into a 4000. I don't need all of those whacky morning zoo radio type presets.
Thanks for chiming in with your info. Nick.