It sounds like something is stealing focus away from GPL. Push the
mouse towards the upper left (never mind that the cursor either doesn't
move, or isn't visible), and click the left mouse button. If this gets
your sound back, but you are then soon disconnected from the server,
then your Internet connection has probably closed down, and the thing
that was stealing focus away from GPL was a dialog box asking if you
want to reconnect.
On Win95... Double click on My Computer. Open the Dialup Networking
folder. Right click on the icon for your Internet connection, and
select Properties. Select the General tab, and hit Configure. Select
the Connection tab, and remove the check-mark from the line that says
"Disconnect a call if idle for mor then <N> mins." Windows' notion of
"idle" is screwy. Just be sure to manually disconnect from you ISP,
since the machine will no longer do it for you automatically.
If that's not it, any program that activates itself while the system is
idle (virus checker, screen saver (though we try to disable these),
power management stuff, ...) could rear its ugly head. If you whack
the space bar once every few minutes while driving and you no longer
have the problem, then it's something along these lines.
Randy