Welcome to the forum! Don't feel bad about the nature of your first post - complaints are pretty common 'first posts'.
Your problem should be completely 'inside' the head unit.
- You (or the dealer) might try disconnecting it completely - pull the power plug. Then reconnect, forcing a re-boot. Or,
- In the unit's setup, there might be a 'restore defaults' option or something similar - try that. Or,
- the Subaru dealer might be able to re-flash the head unit firmware. Or,
If none of the above solves the problem, then replace the head unit. I agree with you - the radio should mute for GPS or blu-tooth.
Your problem should be completely 'inside' the head unit.
- You (or the dealer) might try disconnecting it completely - pull the power plug. Then reconnect, forcing a re-boot. Or,
- In the unit's setup, there might be a 'restore defaults' option or something similar - try that. Or,
- the Subaru dealer might be able to re-flash the head unit firmware. Or,
If none of the above solves the problem, then replace the head unit. I agree with you - the radio should mute for GPS or blu-tooth.