Thick Walls
I live in a one bedroom flat, it was converted from an old folks home 30 years ago and before that the building was 2 houses. So as I am sure you can imagine all of it has been a little knocked around over the years and this leads to some interesting issues with my network. The wall between my lounge and bedroom is thick enough that wifi signal drops by about 65%, combine that with the Wifi signals from the flats around us and its possible to lose signal completely from time to time!
I used the site survey tools from work to run a check on the place and no one could believe that this was possible in a small flat, that less than 10 metres from the router you will not get usable signal. Interestingly, once I wired my home network and put anything that could be on a cable on one, this improved things a great deal and I am now able to watch iplayer/netflix on my tablet in bed.
Biting the hand that feeds IT
