That's why I have the CM10.1 image--to avoid those problems. My DD is still CM10 due to the BT issue.
So my question is really about dirty flashing latest CM10.1 with new kernel and SU + new gapps over a JB4.2.2 experimental CM10.1 with JB4.2.1 gapps.
I clean flashed 10 and dirty flashed 10.1, from the update app when it notified me it was available.
I had to update GAPPs, delete clock data, and then reinstall facebook a few days later. I've had a few problems since that required a reboot, but have found it much smoother, snappier, and more stable than 10 ever was. I do have some BT isses with file sharing, but it works fine with my BT headset.
I also flashed the nitest kernel and the NS4G modem, and things got even better.I actually like it so much I bought a "new" Epic 4G to replace my 2 year old phone, which is pretty banged up.
Gonna hold off another year before changing phones.