So after my recent post about the new Commodore64 working so well, it all changed. The C64 started doing odd things and crashing, and it was happening quicker and quicker. Damn you Commodore, am I never meant to just enjoy the C64?
Once I had some time I dug out a power supply I had bought for my old non loading C64 and plugged that in. I loaded up a game and started playing, and another, and after 2 hours all is still working. So in this case it seems as if just a dodgy power supply is the only problem.