update ...

i think finally my problem has been solved... and I think it was the 5v power that I was supplying from a computer power supply to the MC and servo card...

I went out and bought 2 5volts adaptors and connected each card to the adaptors...

3 days so far and I've done more than 5 flights, 1 hour each and everytihing is working excellent... No freeze ups... and I have all my usb's connected to the main FSX computer... and also I have plugged the MC and servo card into the hub.. So everything looks good so far...

thanks for the suggestions... been cracking at the problem for almost a month now.. now I can finally fly ... hehehe!!