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I have Dell PC, and I use Windows XP.

After using Firefox for extended periods, my audio starts cutting out, as though someone is pressing play and pause continuously, and the mouse pointer lags.

The only thing that seems to help is restarting the computer.

How do I fix this?

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Why tagged firefox? And I think you will need to provide more detail to get a specific answer, this could be anything ranging from a virus to simply overheating. –  Thomas Jul 30 '12 at 7:01
    
because this happens oten when i use firefox for browsing for a long time and i find cbu consuming increase –  just_name Jul 30 '12 at 7:04
    
What happens if you close Firefox? Does the problem go away? –  user3463 Jul 30 '12 at 7:35
    
No, may be after a period of time of closing the firefox –  just_name Jul 30 '12 at 8:13
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I have same problem on my laptop. I re-install and update my sound driver + update FireFox to last version. For now I don't have problems. What did you try so far ? –  Jason Paddle Jul 30 '12 at 12:44

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