rFactor Framerate replay issue

Hello guys since moths I am having issues recording replay videos on rF. Since I 'm using the Nvidia Gtx 680 2gb I've got a massive video improvment and my framerate was constant 90fps. Now don't know what happened after months it went down to 60 but often goes down to 30 fps during the recording of the lap. I'm using with fraps what could be causing this issue? Nvidia updates?
 
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