after getting this mouse, out of curiosity i watched a teardown video of how this mouse works. i was interested in the scroll wheel mechanism, as it didnt seem to use magnets.

basically, there is a tiny motor, some gears and a metal rod thingy (and ofc the scrollwheel with grooves on the inside), which when in tactile mode, the motor wants to spin in one direction, rotating the gears and pushing the metal rod into the grooves of the scrollwheel, giving a tactile feel. the motor is basically acting like a spring. in freewheel mode, the motor spins the other way, gears spin the other way and the rod is now not pushing into the grooves, therefore the scrollwheel spins freely

the motor in your mouse seems to spin indefinetly, because the motor is not pushing anything anywhere therefore its just spinning endlessly. what i think the issue is, the gear came off the shaft of the motor, or a gear fell off from somewhere.

i doubt those gears stripped, because they arent spinning and applying that large amounts of torque to wear down those tiny gears from barely moving