I was just wondering..

Is there some kind of web wide rss glitch thingy or a certain areas or platforms or whatever you call them glitch? A lot of my rss feeds aren't updating. I mean there were always sites where it was always fucked up but now all of a sudden a bunch that were working flawlessly all this time are jammed or whatever happens to them. I find it quite vexing and wondered if there's a reason for it or if it just happens to be a coincidence. Well?