What's happening to my Wireless? Goes off periodically.

Info:
Compaq Presario CQ43-310AU
Windows 7 Home Premium + Lubuntu 12.10
Added 2GB RAM
Ralink RT5390
Hello people.
Well, here's my problem. The strange thing with my wireless is that it periodically breaks down, making wireless networking impossible. Even more strange is, it happens about two reboots after I've used wireless networking intensively. However, the card will work again if I detach and reattach the card off the computer.
Also, I notice there's a cable attached to the card. However, although there is only one cable, there seems to be two places that could be attached on the card. Why is this? What would happen if I unwittingly attach the cord on the other port?
But most importantly, can I stop the wireless from malfunctioning?
Thanks!

The problem is that it must be an HP branded card and specifically one of the ones originally offered on the machine. That is why I gave you the parts list. If you install a better card with one antenna it is going to defeat the purpose. Not sure where to get a wireless card in New Zealand.

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