@zalmanrosenthal Sorry for the late reply (this is my first time visiting this page), but it turned out my scroll wheel had accumulated a bunch of dust and hair around the axle. I hadn't noticed a tactile difference, so I hadn't known about it until I opened my mouse up this afternoon. I detached the wheel and was able to slip the tangled debris off after loosening it with an exacto blade. If you plan to clean your mouse to fix this issue, check that area first. I also recommend fully disassembling and dusting the inside of the mouse to prevent any hidden debris from messing things up the second you close it again. (It sounds gross, but I have a couple of pets in the house. I've also had this mouse for a few years at this point.)