When I do a complete wipe, functionality comes back. Immediately after reinstalling my apps (without restoring data), functionality is still there, but after a short time the problem resurfaces. I haven't determined if it is an app or if the problem occurs after a service starts.
The only things that occurred prior to the problem resurfacing were the passage of time, opening several apps that require root - including SetCPU, SD Maid, AdFree, BatteryCalibration, and Titanium, and the receipt of 2 phone calls.
Is there any way, short of freezing/uninstalling apps and services one at a time, that I can figure out what's doing this?
It happens with both CM7 and CM9 nightlies.