Stop Chrome from reloading tabs

What helped as a general solution for all tabs for me:

you can turn this off by going to "chrome://flags/" and selecting "Disabled" under "Enable tab discarding "

(taken from https://www.reddit.com/r/chrome/comments/3kg79l/chrome_keeps_refreshing_every_page_and_its/d0dtcqx)

From information written on Chromium OS site (which applies to the Chrome browser as well) here, it says that the tabs are getting "hibernated" because your device is getting low on memory.

It suggests that you: "Close some tabs or uninstall extensions that take a lot of memory. If there's a specific tab you don't want discarded, right-click on the tab and pin it."

Also, according to this second article, experimental version of Chrome (Chrome 46 Canary build, at the time of writing this answer) will implement a feature called Tab Discarding, which will preserve the state of the tabs that will be discarded.

Hope it helps.