What I see is things work normally for a couple of minutes, I can load pages quickly and fine. Then suddenly it stops. I get Page can't be displayed errors for about 3-4 minutes. Then just as suddenly, all is back to normal for another few minutes. Then repeat.

I don't see it happen at any particular time of day.

I have wondered if it's related to someone uploading a large file, slowing down the rest of the server processing. That is something a webhost could check.

Other than that, I can't see any reason why this should be happening as it does. It's long-term and consistent, for me at least.

(And by the way, I'm a web programmer, PhD in computer science, with 20+ years as programmer and manager for IBM, and several complex game and business websites of my own, so I'm not completely ignorant of the tech aspects here)