2 and 3 must be either full of crap like you mention
or have dodgy network settings where perhaps one is trying to route more network traffic than it should, or something.

I guess if you've got all four on the same network they all need to be on the same level.
( moohalaa, Sat 25 Jun 2011, 13:14, archived)

You're talking about a network
This is a home network, its just 4 computers plugged into a router. I'm not really sure what settings there actually are to change!
( WormuIus, Sat 25 Jun 2011, 13:16, archived)

Also, this has happened suddenly and for no apparent reason
I can't think of anything which has changed on any of the computers.
( WormuIus, Sat 25 Jun 2011, 13:16, archived)

is it wireless?
Could someone be stealing some of your internets? Could explain why it comes and goes intermittently? I dunno. Go ask someone else. Soz.
( Windy Pig I'm naturally quite suspicious about the moon., Sat 25 Jun 2011, 13:40, archived)

microwave / cordless phones on?
change the router channel / password / MAC filter only those four PCs?
( moohalaa, Sat 25 Jun 2011, 13:42, archived)