Also, if you are using WiFi it may help to change the channel. That would be done in the settings of your wireless router or access point. WiFi channels are numbered 1 through 11 (in the USA; up to slightly higher numbers in some other countries), and if you are on a channel that is the same as or close to a channel used by a neighbor, or a cordless phone or other wireless device, that could be causing the problem. Using software that came with some of my WiFi adapters I've found that my neighbors use channels 1 and 6, which I suspect are the default settings of their wireless routers or access points, so I use channel 11.
Regards,
-- Al