How do I figure out what's wrong with my internet?

[M]

My internet's been always cutting in and out over the last few months, but I'm not sure how I can locate the source of the problem. There's a few things that make it really confusing.

1. Pages often won't open on google chrome, but at the same time, I can still play on a Minecraft server.
2. I sometimes have the same problems on my phone, tablet where the connection will just disappear, and I have to reconnect.
3. It sometimes works to disconnect my internet and reconnect. Or if I refresh for about 5 minutes, the page will finally load.

I'm guessing it could be any of the following factors:
-Internet Browser
-My computer's wireless capability
-The router
-The ISP

I don't know if that information might help in determining a problem. Any ideas on how to figure out what the problem is would be appreciated!