Wireless problem

Stoned Hippy

I set up my network last October and have been using it trouble free until about a week ago.
For the last week it seeems like my router has been freezing or something, webpages don't load and give an error saying "No content" in firefox. Also, I can't stream anything off my desktop running as a server downstairs as it stops every minute or two. The connection never drops but looking at my network meter traffic stops completely (bit/s) every minute of two for less than a minute.

Looking at the log of my router (DIR-655) i'm getting a lot of these errors "Wireless system with MAC address XXXXXXXXXXXX disconnected for reason: Received Deauthentication."

I've tried rebooting and resetting my router but this had no real effect. I've also tried reinstalling drivers for the wireless card on my laptop (before I found out my housemates computer was having the same problems).

I'm using my BB modem as a DHCP server, the wireless network has WPA security and is running in b/g/n mode (my laptop has N) and in mixed 20/40mhz frequency.

Any help would be appreciated,
Thanks,
S.h.2001