Hello woj130,
We see you need help with the audio settings within GarageBand on your Mac. You mention that you need to correct them on occasion from switching to other audio sources. There are steps in this linked article that could help: If GarageBand isn't working on your Mac
Disable Audio Units plug-ins
If you're using Audio Units plug-ins, try disabling them. Damaged or incompatible Audio Units plug-ins can create unexpected behavior in GarageBand.
To disable Audio Units plug-ins:
1. Open a project in GarageBand.
2. Go to GarageBand > Preferences > Audio/MIDI, and deselect Audio Units.
3. Play back a project that has been experiencing issues.
If the project opens and plays back properly, a plug-in you're using in the project might be damaged or incompatible with your version of GarageBand. Check with the manufacturer of the plug-in for support.
If those steps don't help, you'll next want to reach out to Apple Support directly. You can reach them here: Get Support
You can also find the support phone number for your region at this link: Contact Apple for support and service
All the best.