So it stopped, fix it yourself. Easier than reloading is, so why not? Nothing to doing it and it will save you a good chunk of change.
If the motor hums but won't turn, the bearings are gummed and stuck (there are no brushes). Disassemble the bottom covers so you can put a few drops of a good, light oil on each of the shaft end at the bronze bearings. DO NOT USE WD-40; it will work fine at first but will quickly dry out and gum even worse than before. I use Automatic Transmission Fluid as both an excellant gun oil and for lubing small jobs such as this one. The motor should then spin fine.
If it's not humming, the motor or wiring is defective and that's a tad more difficult to fix. If you don't have a volt meter you need it anyway so get one. A small, cheap Chinese made voltmeter sells for as little as $4-6 or so from Walmart, etc.
Disassemble the base of the tumbler so you can read across the wiring with the cord plugged IN and switched ON. Put one probe tip on any bare white wire (common) and one on the black (hot) wire where it connects to the motor. You should see a voltage about 110AC.
If there is no voltage, the switch is probably bad, replace it. If there is voltage, the motor is bad, replace that.
Those small motors are common items, used mostly for bath and kitchen vent fans. Most electical supply houses, including many Lowes/H'Dpot stores, will have them for about $8. Remove your's and take it with you to find a replacement motor that has the same shaft size and mounting hole placement. And approximately the same wattage too, but that's not critical. IF you find one with ball bearings that would be better but those can be hard to find, and a bit more expensive too.
Good luck!
