Sound off and audio/video apps blocked

For a few days I have a very weird problem. After a few hours of using the computer (4-5, I leave it on when I go to work so I can stream my music), everything related to sound is dead.
For example, mpd dies without any errors written in the error log. If I try to restart it doesn't work. It just hangs with no errors. Also, if I try to open a flash video in any browser, the browser just hangs on with no errors. I even tried to open amarok from the shell and just hangs with no errors.
The problem disappears after I reboot the computer, so I think it's something related to the sound driver. I have a Creative Audigy SE card.
I'd like to be more explicit, but I don't know what and where to look for logs. Maybe next time it happens I'll put here some logs if someone gave me a hint.

Don't seem like a hardware failure to me (at least little probable). I'm experiencing the same problem.
As long as I can remember I've got this one at one point in the past too, but back then I haven't got much time to investigate and after some updates all have sorted out itself.
I also don't think it's a client problem since the hang happens with both mpc and sonata on my setup. Also mdp (runned as --verbose --no-daemon --stdout) says:
interface 0: process command "status"
interface 0: command returned 0
interface 0: process command "currentsong"
interface 0: command returned 0
interface 0: process command "play"
Bang! Nothing more at this point: no actions calls, no events, no more infos. Although after a couple of minutes or after killing mpd there's added:
interface 0: command returned 0
interface 1: opened from 192.168.0.3
interface 0: process command "status"
playlist: play 34:"Misc/Fall Out Boy - Dead On Arrival.mp3"
closeAllListenSockets called
closing listen socket 0
closing listen socket 1
interface 0: closed
interface 1: closed
took 0.010000 to init player
copyMpdTagToOB: !acceptMetadata || !tag
decoder PID: 8621
copyMpdTagToOB: !acceptMetadata || !tag
interface 0: command returned 0
interface 0: problems writing
Max Connections Reached!
interface 1: closed
interface 1: opened from 192.168.0.3
Max Connections Reached!
interface 1: closed
main process got SIGINT or SIGTERM, exiting
interface 0: closed
closeAllListenSockets called
closing listen socket 0
closing listen socket 1
closeMp3Directory took 0.010000 seconds
cleaning up pid file
Bizarre? Yes! . Couriuos? Even more so!
Also I've found this bug on mpd's mantis: http://www.musicpd.org/mantis/view.php?id=1479. So it's cross-distro and cross-hardware since I've got:
00:06.0 Multimedia audio controller: nVidia Corporation nForce2 AC97 Audio Controler (MCP) (rev a1)
and experienced it previously on some via and cmi. I hope someone will come with solution soon. I mean—it's getting bad on my listening addiction .
Oh! I forgot to mention that I've tried both specifying "device" and leaving it out in "audio_output".

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