Hello everybody!!! It's almost a week i've problem with my audio device. untill 4 days ago ti worked perfectly but now the sound sometimes disappear every 2-5 minutes for 2-10 seconds and then reappear. this happens to me on youtube and skype, instead when i play a mp3 file it doesen't. i've not made any changes nor installed any particular package. i've installed the ubuntu-extra package but it made no difference.

my audio device is:

Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
Subsystem: Hewlett-Packard Company Device 360e
Flags: bus master, fast devsel, latency 0, IRQ 47
Memory at 98900000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel

do you have any idea?i think it could be something about some plugin or similar, youtube uses flash but skype?

thank you very much!!!
and sorry for any grammar error!!!