What else is running? I have 2 machines with the same setup with 4x7970 with no problems.
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I had 2 separate machines - one connected via the LAN and one via wireless same internet connection, and they both did the same thing. I think it has something to do with a connection drop.
Does yours do it when your Internet connection pauses/hangs or drops?
No. It's been quite a few versions before I had that issue.