It seems to me a lot of old issues have popped up with this release.
No sound, No Bass, Black Screen on Backup, Hands Free Call issues.
None of them are new problems though. And for many they resolve themselves over a little bit of time and maybe a few reboots.
I have to wonder if after an update the system might be doing some background house keeping. Like some Calibration for example.
And the other tasks/threads (possibly lower priority) are not getting their normal CPU slice and acting up until that background house keeping is done.
Or if not calibration perhaps it's downloading new map data, decompressing map data. Or optimizing maps for your locale.
Just a hunch something is "busy" for a while after a big update. It certainly doesn't explain some of these issues being persistent for some folks but perhaps sometimes what ever that busy task might be has an issue and is not finishing.
I manage embedded projects (100x simpler than this) and we do that sort of thing all the time. Typically it's visible to the user though. But not always.
BTW if it is some background task crunching on something, the worst thing you could do is reboot
Because it might have to start over.
Just food for thought.