Board Thread:Game Discussions/@comment-25340405-20170215092139/@comment-27862737-20170216013721

That's all I would be able to recommend as well, except for possibly removing the game completely and reinstalling (since it's linked to your Google Play, you should be able to reinstall and then restore your save from there).

I had the same problem on an older tablet (it kept losing the "link" with Google Play and I had to constantly retrieve my account), but after upgrading to a newer tablet, the problem went away.