That bit about the glove box power bank is real, mine lives in the car now after way too many dead phone sunsets.

Kept a tally of drywall anchors for a while, the plastic ones that come with TV mounts. Got up past 300 before I tossed the box. What stuck with me was not the count, it was that I switched brands around 200 and stopped stripping them out. Cheaper anchors, go figure. Same deal as your resistors, the number is not really the point. It just shows you when the thing you were doing finally clicked. I still test every outlet before I put the plate back on, even if it is one outlet behind a couch nobody will ever move.

Did the guy put down a full base or just sand? That's usually the whole story right there. Two months is way too fast for that much settling unless the base was too thin or the dirt under it wasn't packed down. Re-sanding will fill the gaps and stop the rocking for a bit, but it won't fix a bad base, so if that corner keeps dropping you're pulling stones.