XprotectService's massive data reading slowing my computer down - Help please

XprotectService is currently insisting on reading many GB of data every bootup, which slows down the responsiveness of my computer. It gets even less responsive once the data read gets into the teens of GB. And I don’t think it's near done then, because the last time this happened, it went over 30 GB at one point. I have no idea what made it clear up last time.

Does anyone know what could cause this and/or how I can fix it?

Some info:

I am running Catalina OS. (Though I may have been running Mojave last time, not sure.)

I have tried booting into Safe Mode and it happens there, too.

I am using a secondary, non-admin account, though I have access to the admin account if needed.

I normally leave the computer on and restart daily, but I've shut it down twice today, and we had a power outage 2 days ago (luckily I think it was just on the user login screen at the time, unless it wasn't finished booting up. But the problem seems to have started today.)