wireless issues gateway netbook lt20

hello guys, I have an issue with my netbook wireless. Every time i use my netbook the wireless works for awhile then suddenly it will turn off on me and i can't turn on my wireless unless I close my netbook and turn it back on again from sleep mode. Then suddenly my wireless will work again. Its pissing me off when I"m watching youtube videos then suddenly youtube won't load because my wifi just suddenly turns off. I don't know what is going on with this netbook, i had it for 2yrs and couple of months now and just recently about 4-5 months ago my wifi would turn off. It would turn off once in awhile but now it does it very very frequently. I am very much annoyed with this and i don't know how to fix it.. did everything from re-installing the wireless driver to system restoring. Nothing seem's to fix this issue and its quite very much annoying..

Any of you has come across this issue and find a way to fix it? I use this netbook strictly for school and if seems to be doing this i'm gonna be needing a new one.

 

replacing wifi card is pretty easy and affordable!

 

do you know where exactly the wireless network card is located in the back? the only slot that is open isn't the wireless card in the back. or do i have to open it all up to locate it?

 

if you have wifi cover like this
Gateway LT20 Wi-Fi Wireless Door Cover AP085000200 | eBay
so it's got to be behind it