Same problem here!
I also tried several things to solve this problem and also thought it might be wasteland. But no success yet.
Would be nice to know if this happens to everyone or if someone managed to fix this problem.
My server:
Windows Server 2008 r2
Intel XEON E3 1230 CPU mit 4 x 3,2 GHz
16 GB DDR3
1000 Mbit
- cube