Could be broken pawls in the ratchet mech. Or springs. They're repairable if you have patience. Bike shops will give you parts for them more than likely. What kind of hub is it? Fairly common or remote chance? If I were local I'd have a go at it. You can always find a used hub and relace the wheel provided the hub dims are the same. Can even use the old hub, just make sure you relace the spokes in the correct orientation int he hub..that is, put the spokes back into the grooves worn by the original spokes.
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