[ubuntu] Skype problems with big CPU usage, crashes, and soun disapears!

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http://ubuntuforums.org – Hello to everyone, i have a HP pavilion, dual core 2.4, 3GB ram, ubuntu 11.10 and win 7 dual boot. So my problem is, when i make a skype call my cpu grows to 70%!! my notebook fan starts to work really loud, (like if I'm playing the new batelfield :D) after 10-15 min the sound disapeares from the hole system!! and after that skype crashes! ](*,) i mast to restart my pc to make the sound work again!! And please help, i need skype to work perfect because i use it for my work, and i don't wont to go back to windows because skype dosen't work :( Sory for my englesh! (Hardware)