Originally Posted by PAPY2000

Yep, it could definitely be a heat issue, either from failing fans, or just dust starting to build up. Try to use a can of difluoroethane gas to clean it out as best as possible. When you mentioned it's getting loud before shutting down, I'm assuming this is the fans speeding up attempting to deal with the heat. As always, make sure you're using the laptop on a surface that doesn't obstruct any intake or exhaust vents.