CH PRODUCTS USB Flight Yoke and Rudder Pedals

I have used fsx under XP Home basic and now Vista Home Premium 64 bit. I have
never had any problems until after installing SP1. My flight yoke and pedals
stop working after a few minutes into a flight. If I unplug the two from the
usb ports and plug them back in again I get the unrecognized device message
in the system tray. I also installed sp2 hoping it would correct it but I
still have the same problem. Has anyone else had the same problem or know of
a solution?
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Duo core 6320
2 gigs ram
EVGA 8600 GTS
Vista Home Premium - 64 bit