FLME + Decklink Studio: Dropping frames after 10h of streaming

Hi!

We just bought two Decklink Studio cards to use with our live streaming servers.

First, everything works fine. We have high quality flash live streaming, using SDI input with embedded audio.

But after approximately 10 hours of streaming,  the quality comes down, and the frame rate too, looks like the encoder start are  dropping  frames.

Then if we just try to stop the live encoder, they freeze.
The only way to close the program is forcing with CRTL+ALT+DEL.

At this time, if we restart the FMLE, all works fine again, for more or less 10 hours.

The specs are:

FLME 3.1
Windows Server 2008 R2 (64)
Decklink Driver 7.5.2.0
Dell PowerEdge R610
16GB RAM
Dual Intel Xeon E5504

Can you guys help me with this problem?

Thanks

Marcelo Guerra