USB microphone (Samson C01U) works, then disappears

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http://askubuntu.com – I recently upgraded from Ubuntu 11.10 to 12.04. My Samson C01U USB microphone, which has worked for many years on Ubuntu, now is having problems. The symptom is as follows. After a reboot, the microphone works as expected. Recording with Audacity is fine. Then, after some indeterminate amount of time, the microphone disappears from the system. That is, it is no longer listed in pavucontrol or alsamixer. Unplugging and re-plugging the microphone does not resolve the problem. Occasionally, the microphone will appear in pavucontrol for an instant on re-plug, but disappear immediately. I (HowTos)