I'm 3/4 of the way through completing an extremely important job list and the controller has just started giving errors and beeping and flickering, showing random symbols at different sizes all over the screen. You name it.

It started off as a dodgy connection to the PC, I was hoping it would be the PC instead of the NC because that would be a lot easier to fix. I have no idea where to start on this thing...

Any recommendations on what to look at first?

I think it may be an electrical component somewhere inside, or maybe even a battery? I'm not sure...