New user with DS220+ constantly running 50% memory, spikes in CPU

I have a DS220+ with two 12TB drives. In the past few months, we’ve heard it running at high speed / like it’s indexing (I think). this happened a few times, and now does it all day, to the point we shut it down out of concern, All we have on it is photos. I tried a script to stop indexing, but that did not stop it. Any help would be great.