Q: Keychain keeps unlocking.

Hello playinglovesongs,

Thank you for using the Apple Support Communities. I know having an issue with keychain on your Mac is not what you expect. Based on what you stated, it seems you may be experiencing / having issues with apps accessing your keychain and passwords. To resolve this, use Safe Mode to start up your Mac so that it performs certain checks, delete system cache files, verifies your startup disk, and attempts to repair directory issues if needed. Log into your user account in Safe Mode and test the issue again, then restart your Mac normally and test the issue one more time.

Try safe mode if your Mac doesn't finish starting up
Limited graphics performance in OS X recovery or safe mode

Here is some additional info about keychain and how it works on your Mac that may help explain why this could be happening:

OS X El Capitan: About your keychain password
OS X El Capitan: Allow apps to access your keychain

Cheers!