I assume there are many of wireless networks round your home.
The thing is that you have to use different channel to avoid collisions.
To me, collisions occur when there is high peak of Internet usage round my apartments and I have lost connectivity errors like Limited or No Connectivity and sometimes it's connected but no Internet connection, ie. nslookup says 'DNS timed out for google.com'.
For this case, no matter how many times you turn off and turn back on your router, it doesn't help. I googled and found this tip (use different channels) in about.com. The product documentation states collisions only with electronic devices like TV.
I never thought of wireless networks can collide one another.
Choose the channels that are not default one (choose not 1,6,11 but 3,7,8,10,12,13).
Higher is safe because I learn that lower ones are used by devices like TV.
At first, I thought that it was my computer so I booted with another OS - still the same. [you must ensure you try to do like me]
So, then I thought it might be my wireless router hang. Turned it off and it on again and again. It didn't help. Now I've solved it myself.
Hope that helps.