Connection Problems

[pinarphan]

My rig has 2 5850s and one runs for days without interruption.  The other runs for 5 or 6 hours then has "connection problems"  It is wrecking my productivity. 

Any help would be greatly appreciated

2011-11-16 08:41:32: Listener for "5830": btcguild.com:8332 16/11/2011 08:41:32, long poll: new block 00000cceb0848d58
2011-11-16 08:51:41: Listener for "5850": btcguild.com:8332 16/11/2011 08:51:41, Problems communicating with bitcoin RPC 0 2
2011-11-16 08:51:47: Listener for "5850": btcguild.com:8332 16/11/2011 08:51:47, Problems communicating with bitcoin RPC 1 2
2011-11-16 08:51:54: Listener for "5850": btcguild.com:8332 16/11/2011 08:51:54, Problems communicating with bitcoin RPC 2 2
2011-11-16 08:51:58: Listener for "5830": btcguild.com:8332 16/11/2011 08:51:58, Problems communicating with bitcoin RPC 0 2
2011-11-16 08:52:01: Listener for "5850": btcguild.com:8332 16/11/2011 08:52:01, Problems communicating with bitcoin RPC 3 2
2011-11-16 08:52:01: Listener for "5850": btcguild.com:8332 16/11/2011 08:52:01, No more backup pools left. Using primary and starting over.
2011-11-16 08:52:02: Listener for "5850": btcguild.com:8332 16/11/2011 08:52:02, long poll: new block 000007829335b07b
2011-11-16 08:52:05: Listener for "5830": btcguild.com:8332 16/11/2011 08:52:05, long poll: new block 000007829335b07b
2011-11-16 08:59:34: Listener for "5830" shutting down

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[1715392758]

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[1715392758]

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[RyNinDaCleM]

Just one card has problems? Are you overclocked? Temps?

[pinarphan]

They are both Saphire 5850's running at 900/300/1088 and stay between 70 and 76c.

Thanks for helping! I'm stumped