Yes, the browser refresh rate is at 5 minutes, I had several stations open in separate tabs at once and the 5 minute refresh was fairly consistent, so it sounds like that's the issue.
It's technically not an "issue" - it's a "feature". It's set by Davis, and you can't change it.
If you look at the page source of any of those stations, you will see:
<meta http-equiv="refresh" content="300">
Which means - refresh every 300 seconds.
The vast majority of web pages that you visit, do not automatically refresh at all, of course.