Fps laggs .. What Should I do?

Hello,
I have since 3-4 Days permanend Fps lag .. I always have 59,9 Fps .. before it, i had always between 180 and 220 Fps. Sometimes when I play a match, i switch sometimes for 20sec to Teamspeak3 and then when i switch to Crossfire back, i have normal Fps(180-220), but only for ONE Round, not for a Match. Next Round i have the Fps lag again .. I don't know, what I should do. I downloaded Crossfire again 2 days ago, but nothing changed( Of Course i removed Crossfire 100% like the Settings,...) Yesterday i changed my Graphic Settings, but nothing changed.. Of Course I Always Run CF as Administrator..
My System:
CPU: Intel Core i7 2600k
RAM: 16gb ram 1333mhz
Graphic: NVIDIA Geforce GTX 560 Ti
Windows 7 Home Premium 64 Bit

Can You Help me?

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