:( there are too many unknown variables there to give you an answer. Do you have a schematic? Does the audio cut out for ALL oscillators? or just the one you're adjusting? Does the chip heat up? You may just need to add a resistor in series with the pot... maybe 1k so that even when the pot is all the way up there is still a bit of resistance in there. Maybe the potentiometer is faulty and the resistive material is corroded so there's no connection when it is turned all the way up. This has happened to me a few times. or... maybe