What can interfere with Wireless Router signal?

For me, everytime the microwave is on, I can't use the internet, but chat messages will still show up for some reason.

A lot of things can interfere, e.g.

• thick walls
• thick walls with steel reinforcements
• metal objects like heaters or bathtubs
• other wifi sources/receivers (with smart TVs there is quite a lot of wifi networks everywhere)
• other microwave 2,4GHz radio signals (microwave oven, wireless keyboards/mice)

Overall wifi is just crap. You shouldn't rely on it as your main network if you have any choice of using cable ethernet.

My beard and my mind.

A mechant robot streaming inverse waves of your wireless device ?

ECM Jammer, you are about to get robbed.

mostly what cyberkiller listed, older homes with lead pipeing can down-grade signals as well. With other wireless signals and such, most routers, if not all, allow you to change your channel, which cuts back on any other interference like phones and other routers nearby. Wireless is really not ideal for gaming at all, you can always expect to get cut-off one way or another. I suggest looking closely in your router settings, start with the channel and then maybe try adding your mac address to the router for a more stable connection

Denpa Men ^^

Our wireless baby monitor fills every 2.4 channel and completely wipes out router traffic. Any wideband 2.4 GHz wireless device will absolutely muller your routers wireless bandwidth. It's especially frustrating because you can still connect at full strength.
Have you scanned to find an empty channel? It's possible that your neighbours and you are trying to use the same channel.

Most of the time when my brother or his lame ass friend enters my wifi's AOE it cuts out >.>

Light, electricity, God, walls, metal, other wlan networks, taco bell, etc...
Plus its all about router quality, I got some german uber fritzbox.

microwave, other routers ...

Telephones are a major source of interfering with both WLAN and the basic functioning of any nearby other device. Do not build towers with your devices. Make sure every device is at least 1m apart from another. Of course some may still work flawlessly if you staple them or have them really next to each other, but some seriously do not for no apparent reason. You'll have to try and you might get surprised that spreading all your stuff apart can help.