Extremely slow wireless speeds on brand new F22? Please help me!!!

OK, so my wireless internet keeps cutting out on my brand new F22. It will be working (hardly), then just stop, then come on again. Running a speedtest, I get a result of 1mbps download speed, as opposed to when I'm wired in, where I get 50mbps and it doesn't cut out at all. I spent almost 90 minutes with Sony Customer Care remote accessing my computer, only for them to try and tell me that my wireless card can't support speeds that high and that this is completely normal, which I'm pretty sure is obvious bull****. What on earth could the problem possibly be? What can I do to try and fix it? I can hardly use my internet wirelessly which is becoming a massive problem.

EDIT: I've read that changing the encryption type on the connection from AES to TKIP will fix it. I did that, and it has gone some way in helping it, but it hasn't completely repaired it. After changing to TKIP, im getting 25mbps. So halfway there haha. What else could be getting in the way?

 

turn off the power saving for the network card.

 

Yeah, already done that. Didn't help.