Some times the cables attached to the shifter strech and the chain doesn't move over far enough to get on to the next sprocket so it slips off making a clunking sound as it falls off the gear tooth and lands back onto the lower gear.
Adjust the cable tension at the derailler depending how much more movement you need in the shift deraillers.
The wheels of the bike has a problem try to check the bearing the housing of the wheels of the bike.
Check the chain alignment may need to adjust shifter cable.
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