My router is acting up?

[Crimson]

For the past two weeks, my wireless connection has been crappy. I have reset my router multiple times to see if that would work, but it didn't. I used to be able to watch YouTube videos in 720p, but now, each time I click on a video, it'll just stop about 5 seconds in and render to 144p quality, which I'm assuming is poor bandwidth. When I play online on PS3, multiplayer matches tend to lag quite more often, which is what irks me the most. I have a Linksys router with a Sprint modem, btw. So, in a nutshell, I have no clue what could be causing this sudden slow connection to the internet. Does weather interfere with it? Is my speed slowed down from not paying the internet bills on time? What do you think?