Audio midi frequently needs resetting

Hi
I have external speakers connected through a hifi using iMic. Recently the sound keeps cutting out, and I have to open Audio Midi Setup and although the settings are showing 44100.0 Hz I have to click on this in 'output', set it to something else then set it back to 44100.0 Hz. This starts the sound up again but only lasts for about 10 mins at at time. Any ideas?
(apologies if something similar is posted elsewhere, I did do a search & couldn't find the exact same scenario)
Cheers

Hi Klaus
thanks for your help, 30 minutes now and no resetting has been necessary! Fingers x that this has done the trick
Lisa

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