If it aint worn, it must either be chainline, or slack chain. Your pedalling might not be smooth enough to be keeping the chain in tension throughout a full revolution so a slack chain would give it a chance to pop off in that instance.
@Hovis started
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If it aint worn, it must either be chainline, or slack chain. Your pedalling might not be smooth enough to be keeping the chain in tension throughout a full revolution so a slack chain would give it a chance to pop off in that instance.