Having recently had similar "annoying wireless" issues may I share something I learnt.
The basic question to ask is whether there a cordless phone nearby? If it's yours it is then easy to check its frequency 5.8GHz will be ok, 2.4GHz is possibly the problem. Of course a neighbour might also have one. The solution I found was slightly counter intuitive.
Either using your PCs wireless software or a program such as Netstumbler see what other wireless networks are out there and what channels they use. Usually 1, 6 and 11. Change the channel of your wireless router (I realise this might be tricky if it isn't yours) so that it shares the same channel as one or two other networks.
Apparently 2.4GHz is unregulated. Wifi is careful about which precise frequency it uses hence the dozen or so channels. Cordless phones scan the band and find an empty bit and rather roughly at that. So by making sure you use the same channel as other wifi networks you are ensuring the cordless phone will prefer a different more empty patch of bandwidth. The other networks on your channel are unlikely to cause a problem unless they are more powerful than yours which should be closer anyway.
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The basic question to ask is whether there a cordless phone nearby? If it's yours it is then easy to check its frequency 5.8GHz will be ok, 2.4GHz is possibly the problem. Of course a neighbour might also have one. The solution I found was slightly counter intuitive.
Either using your PCs wireless software or a program such as Netstumbler see what other wireless networks are out there and what channels they use. Usually 1, 6 and 11. Change the channel of your wireless router (I realise this might be tricky if it isn't yours) so that it shares the same channel as one or two other networks.
Apparently 2.4GHz is unregulated. Wifi is careful about which precise frequency it uses hence the dozen or so channels. Cordless phones scan the band and find an empty bit and rather roughly at that. So by making sure you use the same channel as other wifi networks you are ensuring the cordless phone will prefer a different more empty patch of bandwidth. The other networks on your channel are unlikely to cause a problem unless they are more powerful than yours which should be closer anyway.