My USB mouse and keyboard hang intermittently.

Very weird things happen, i.e. my mouse's red LED
light begins to flicker in a very weird fashion, or my
keyboard stops responding and my sound output
is suddenly muted by itself (I don't even touch sound).

This was in the /var/log/messages regarding sound:
wrapper-2.0: vfprintf %s NULL in "[xfce-mixer-plugin.
c:374 xfce_mixer_plugin_set_property]: could not
set sound-card to '%s', trying the default card instead"
wrapper-2.0: vfprintf %s NULL in "%s: muted"

Nothing else to show up in /var/log/messages. Is there
a more detailed log?

How do I gather info about this from the system?

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