My internet is fine, and then will become slow at random.

[InTheAbstract]

As the title says, I'll be browsing the internet and be completely fine and be able to watch youtube videos or play Rift or League at a steady 90 or so ping for anywhere from an hour to a whole day and have no issue. Then, It'll skyrocket to 300 ping and go as high as 900 when I'm playing Rift/League. Sometimes, even youtube videos won't buffer and even the 15 second ads for the videos. I'm not sure why, and because we've had this issue for so long we bought a new router. That didn't help one bit! I've gone to speed test when it gets bad and it says that our internet is slow. When the internet is good, speed test says it's perfectly fine. At this point I'm not sure what to do but I can't have an ethernet cable running all the way up the stairs, it's not my house :P So I'm determined to fix this, please guys. And thank you for all of your help! ^^

[remixedcat]

Please ensure you have your router communicating on a non congested wireless channel. You can go to the Google Play store and search for the Amped Wireless Wifi Analytics tool>download it>it will tell you the least congested channels to use as well as other tools.

You may also download the program called InSSIDer if you have a windows based laptop and it will also scan networks and provide the congestion data as well.

From there you would go to the following Router Control Panel area (general example-yours may vary):
More Settings>2.4Ghz Settings>Basic Settings>Select the channel that is the least congested>Apply
Do the same for the 5Ghz band as well.