Your power jack problem is probably either a broken solder joint, or a damaged connector. You could try the following:
1) a bit of switch cleaner
2) check the connector on the wire end (wiggle the cable while holding the connector firmly).
3) take the unit apart and resolder the connector to board joints.
4) replace the connector.
Your pot problem could indeed be a bad solder joint. Worth checking if you have the unit apart.
Or, you could send the unit in for service ( support@eventide.com ).
