First phone call after reboot works, then nothing?

After installing the app, uninstalling, installing the beta and uninstalling (clearing cache and rebooting every time) I still can't get phone calls to work normal anymore. The first call after a reboot works just fine, but whenever I try to call anybody or receive a call after that, neither mic nor speaker works. Just silence on both ends of the call. The same problem after uninstalling the app. Any help on how to get my phone to work as a phone again? I did not have this problem before I installed soundabout.
I'm using a LG Optimus G E975 with CM11.

First to completely clear out any settings from SoundAbout, when uninstalling, make sure to:

1) Go into phone settings and click on Manage apps
2) Scroll to SoundAbout and click it.
3) Click on Clear cache, clear data, force stop, then un-install
4) Then reboot the phone.

What kind of phone do you have and what version of Android is on it?

Why were you trying to use SoundAbout?