By default, if it's using a lot of memory, Chrome purges the contents of some background tabs from RAM to conserve system resources. When you click back onto those tabs, the browser has to reload them because they have been erased from memory.

How do I stop a website from reloading?

Type chrome://extensions in the URL and Navigate to Options. Go to Details and click on Extension options. Tick the option with Disable Meta Refresh elements in pages and click on Close. Additionally one can disable the automatic tab discarding to stop the tabs from auto-refreshing.

What to do if a page keeps reloading?

Microsoft Edge. Microsoft Edge offers no options at this point in time to disable auto-refreshing websites. Edge supports extensions but no extension exists at this point in time that brings functionality to block pages from reloading automatically to the browser.