Check out if the power supply is not defective.
If your WiFi router is compatible, you can flash it with openWRT, with unlocks tons of settings to customize channels and signal.
if you live in a crowded area, try adjusting the broadcast channel. Barring that, it could be the router overheating as Nasstee said before. There's an app for Android called Wifi Scanner. It's usually my first check when my wifi goes crappy. I can see which channels are most crowded. It's also important to note: Due to the way the channel bandwidth works, only channel 1, 6, and 11 are viable. if you attempt any channel other than those three, you can pick up bleed over.
Thanks for the info, I didn't know any of this.
Flashing a router with new software is always a good idea, assuming your router supports it. I use an OLD Linksys router specifically for that reason. However, if your not 100% confident in your tech powers, dont try it because you can brick your device. Also: if you have a company like Comcast which you rent a router from, REALLY REALLY look into buying your own equipment. The rental units nowadays offer public wifi, which can and will effect your performance.
There are so many things that can mess with your wifi that it's hard to say. My best guess is that it's overheating. Make sure there's decent room for air to move around it and it isn't full of dust.
Hmm, that could be it. I mean my wi-fi box is like 9 years old I think.
9 years? It's time to upgrade to something with more antennae and dynamic channel ranges.
Some good advice, here. If you are really paranoid, you can use wireshark to see what is going on over your network. I always find new stuff to block when I do that.
Just throw in a ubiquiti unifi access point and call it a day.
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