My Wi-Fi does not work in my room anymore, what are the causes?

I had no problem with my Wi-Fi like always and one day, in all of the places in my house, only my room does not work. I looked up the internet for solution and many of them did not have my case. I tested my Wi-Fi outside my room and it work but once I entered my room it would not work.

The Wi-Fi signal is still there but it would akways say unable to connect on my iphone, ps3 and laptop. I can safely assume something is disrupting my connection there so I was wondering what can be causing it.

Now before giving me the answer do not tell me it is my other electronic device because it was working well just a few days ago and I did not change anything in my room or in the house.

So the only thing left is my neighbor's house. Can they be cause the disruption of my signal? I live in a duplex house so they are right beside me.

Added (1). I use WPA, I tried resetting my router, I did most of the basic thing I need to do in order to get my internet working.

The router I'm using is the one that Bell has provided me with the black one.

Do you have a WEP key set on your network? If not, than that's most likely the problem and your neighbors are using your network. If you do, try changing your network password, and if that still doesn't work, try restarting your modem/router.

Welcome to the reality of Wi-Fi. There's no guarantee of uninteruptible signal or lack of signal whereever you are or the ability to connect.

In some instances a cordless phone using a 2.4Ghz signal may disrupt Wi-Fi signal.

Another possible reason, would be that the router is beyond it's 90 day warranty and the signal chip may be losing it's ability to push the signal at further distances.