I recently updated my SS to the latest CPU ROM, bought from one of our well known vendors. In the month since then, I have had two weird startup error reports, but the game works OK.
One time the time and date was unset -- but scores and settings were preserved.
Tonight I got a CPU checksum error -- but the game worked fine, I didn't check the report until after playing.
In ~20 years of owning a handful of games I can MAYBE remember one checksum error.
Since I did pop in a new CPU ROM naturally I suspect that is the cause. Should I let it ride until it gets worse? Reseat the ROM? Ask the vendor for a replacement?