Comment 25 for bug 288093

I'm seeing similar symptoms; after using a mixture of flash, banshee, and totem for a while, I have to kill -9 to recover.

My sound device (per lspci) is:
00:05.0 Audio device: nVidia Corporation MCP61 High Definition Audio (rev a2)

meanwhile, https://wiki.ubuntu.com/PulseAudio seems to be out of date; it refers to libflashsupport , but apt says:

Package libflashsupport is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  flashplugin-nonfree-extrasound