Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, the described symptom almost always point to an internal hardware issue or more particularly, possible suspect would be the mechanical linkage / gearing system
The above would require that the Panasonic SC-HC38DB be opened up for visual inspection, mechanical/voltage/continuity/resistance checks, confirm faults and effect repairs.
If comfortably able and feel safe to do so, are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even perhaps a soldering iron?
I understand Cathie.
A Panasonic authorized Service Center would be more to your advantage:
Please click or goto http://au.panasonic.com.au/Support/Customer+support/Service+and+repair