Steps to fix your  tab in Chrome keep reloading:

• With an Extension, Tab Discarding-Unfortunately, the chrome:/flags/#automatic-tab-discarding option has been deprecated and is no longer present in the browser's experimental features list. To get started, open a new Chrome tab and type 'chrome:/extensions' into the Search box. Now, on the extension's page, click on the main menu, which is the three horizontal lines symbol next to Extensions. Then, at the bottom of the side window that appears, click Open Chrome Web Store.
• Select Disable automatic tab discarding from the list of extensions after typing 'tab discarding' into the Search bar. To add the extension to your browser, click Add to Chrome.
• Your device's memory is full. Chrome, like your Android phone or tablet, is secretly removing background tabs to save up memory. When you select one of those tabs, the page reloads.

Read More: Why is the Chrome browser crashing whenever opening Edge in Windows 10?