Do I "Need" to buy anything else?
I am looking to upgrade my PS3 that I have had for ages (since about a year after it came out). It is starting to have issues such as shutting down while in use, resetting the video settings on its own, etc. I use it largely for Blu Ray but do play games and use the apps for Amazon Prime, Hulu, Netflix, etc. DO I have to buy anything else to use this if I am not planning to use online gaming?
Not sure what you mean by "anything else". If your console runs Blu-Rays and apps fine, apart from the obvious things like a TV, internet connection and a Dualshock 4, you don't need anything else.
Now, as far as upgrading goes, the only upgrading you can do on a PS3 is getting a hard drive with more capacity and faster read/write times on said hard drive.
Also, this may not be a big issue, but I have noticed that the newer (more recently manufactured) Dualshock 3s tend to connect muçh faster after the initial pairing.