Disk First Aid running on every boot

As subject, every time I boot this machine up lately the Disk First Aid
alert appears telling me the computer didn't shut down properly and then
it scans for errors. Thing is, I shut the computer down correctly every
time!

Machine is PowerMac G4 MDD 1.25Ghz, OS9.2.2, hard drive is a 256GB SSD
hooked to a Sonnet Tempo SATA PCI card.

Any ideas why this keeps happening? It has done it before in the same way
over the years, there'll be a period where it boots fine and then a period
where it always runs Disk First Aid, and then it'll go back to booting
fine for a time for no rhyme or reason... I have a relatively fresh
install on the machine now, a couple of months old, and it was booting
straight into OS9 for a while before this started happening again. I have
done no recent software installs that correlate with it beginning, either.

I can disable Disk First Aid from ever running at start-up, is that
recommended or cautioned against?