My laptop's sound becomes distorted--Like a chipmunk

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Need a little help here. My 1 year old averatec 3200's sound somehow
becomes distorted sometimes after powering on. I tried updating the
sound drivers but that doesn't work. The only way I can usually get it
back to sounding normal is after I restart the computer.

Any ideas? Hate having to restart my laptop everytime it starts
sounding like a chipmunk.

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