Serial Port Communication Issue

I have two identical mb's both using xp pro w/sp2
They are the foxconn n570sm2aa. With two different serial devices (a fta receiver and a rf signal level meter) i have to first disable the serial port, then re-enable it to be able to communicate with either device. If i don't, i get a error message. My previous mb had a nforce2 chipset and used 2k. I had no issue with two different fta receivers using the serial port. With another piece of test equipment, there is a different problem. The software locks up after 5 seconds after hitting the 'start' button to try to connect with the device (after the s/w is opened). I believe this is aseparate issue since the disable/enable doesn't help. (There was no issue with the previous mb and o/s. )

Any ideas about why i have to disable, then re-enable the port everytime?
Btw; no conflicts in dm and it is the stock windows driver that is loaded.

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