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When that event occurs try to unplug your sound system (speaker) or switch Off for about 20 seconds then On again. If that doesn't give a sound, try instead pull out the Audio Input from the rear socket (usually the Green hole) then re-plug it into the same socket. See if that improves. If not then the problem can be in the motherboard (if audio is on-board) or a contention between two conflicting modules (drivers) that are present in your system --in this case you may need to "blacklist" one of it to avoid subsequent involuntary contention after the audio system is working.
It's a shot in the dark, but try testing with a live CD of something not-Fedora/Red Hat. Allow ample time for the problem to manifest itself.
If it does show up under the Live CD, it's likely something related to the hardware or the interaction between the hardware and the software. If it does not show up under the Live CD, it's something specifically to do with Fedora or Fedora's implementation of the drivers for that card.
I had initially the problem using Ubuntu so I guess it's nothing related to Red Hat.
The thing is that I used skype in my workstation with ubuntu for long long time without problems, then I (think) updated something and the sound stop working. That's why I decided after many many tests to start from scratch and I made a clean installation using fedora.
The streaming videos (youtube for instance) show a strange behaviour when the linux sound stops. They don't run smooth, freeze instead. I remember that the same happened when I was with ubuntu, however they showed in fast forward motion instead.
It's probably driver related. You may be able to avoid rebooting by stopping all sound things and modprobe -r and modprobe the driver (snd-hda-intel). But it's probably simpler to reboot. There's probably a magic flag you can pass to make it play nice. Like noapic or other kernel parameters at boot time. And a few parameters to the snd-hda-intel driver.
# modinfo snd-hda-intel
If only to give you a few things to google on. It seems that windows users have an issue with this same chipset. The fix there is to disable front audio port detection or some such. I'm not sure if there's a linux equivalent to that. Using the latest kernel and latest alsa version might help if it's already been patched.