Wireless problems

[Davi]

Trying to sort brothers network - For some reason the wireless has gone intermittently slow - i.e. DL at 250kbps. Hard wire into the router, you get 5mbps, second laptop tested displayed a very slow wireless as well. Occasionally, and only for a few seconds, wireless will jump to a good 4mbps +, but 99% of the time 250kb...

any thoughts or methods to approach it? Router is a netgear N.... erm... N something or other and only a couple of months old