A small change but significant none the less. The board I purchased from Steve at Mega Micros came with a 33MHz CPU clock. Following some discussion I'd seen on Discord, I increased the clock from 3MHz to 40MHz. I have a 50MHz CPU, so as long as the board is capable of the higher speed, I should be good. It's been running without any problems now for two days so it looks like I'm golden! That's quite a significant improvement.