I've found that the batteries lose contact after w while, so here is what I do:
1) take a pencil eraser and rub each of the contacts with it.
2) lightly apply some petroleum jelly to each end of the battery.
3) make sure the compartment is completely dry. Take a small piece of paper towel, roll it up, and, with the pencil, rub the inside of each of the battery compartments.
4) re-insert batteries and try again. It should work!
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