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There could be a couple of problems. You may be the victim of a recent nVidia update that caused a number of cards to overheat:
...

In the groups of 3 casters what I usually do is charge one and shield bash it then run and stand on top of another caster. The 3rd caster I Heroic Throw silence. Usually this gets them all in one...

Also your other tank may be the target for threat modifiers like Tricks of the Trade and Misdirection.

- Lexib

Looking through your gear, it doesn't look bad at all. You should easily be healable for 10/25 man. Festergut is really dependent on cooldowns until you overgear the encounter. So you may not be...

I think this is what you are looking for:

http://www.tankspot.com/showthread.php?41865-Keybinds-and-You

First of all, whoever told you to gem haste needs to hand in his bubble.

Ret paladin gemming strategy is very easy. Bold Cardinal Rubies for everything except where there is a yellow socket bonus...