Throttle quadrant occasional disruption

[102-YU-gmitar]

Hi!
I'm proudly owner of USB Fighterstick and Throttle quadrant and Saitek Pro Flight rudder and using it in IL2 Sturmovik 1946 with no problem, and Cliffs of Dover (recently bought) with occasional disruption.
Cliffs of Dover: Everything works normal, but after while (cca 20-30sek) Throttle Quadrant cease to function. After some time (10-30 sek) quadrant starts to work normally, but after 10-30 sek stops. There is not regular interval between function and non function. All time joystick works normally.
I must write everything works perfect in IL2 Sturmovik 1946.

My configuration:
MB Asus P8P67 B3Revision
i7 2600K OC 4,7GHz
CM Hyper 212 Plus
2x4GB Transcend DDR3 1333 JM1333KLN-4G
MSI Nvidia 460 GTX Cyclone 1GB
All "flying" gadgets are connected to MB, not via hub...
OS Windows 7 Ultimate 64bit
ESET NOD32 Antivirus 4

Please heeeelp!