I continued to troubleshoot the unit myself (I have a hard time taking the machine to a technician and paying them to have all of the fun), and traced the issue back to an overheating CPU. I've fixed a heatsink to the 7501 and there have been no further freezes or crashes. Here is some more ...

I'm hoping that someone can point me in the right direction for a troublesome Commodore 16 I picked up recently. The unit was a bargain, in it's original box and in great condition, however when I got it home I realized there was a problem with it. The unit seems to power up fine, however it begins ...