I have both a Samsung Tab 4 and Galaxy S6. When I go to open Hay Day today the status bar begins as usual with "Connecting", then changes to "Updating", and finally times out with the "Server not responding" error message. I've tried uninstall/reinstall on the tablet with the same results.

This is nothing new. My wife has found it impossible to launch Hay Day on her Samsung Tab A for the last month or so -- and it's the only app on a brand new tablet she received in December. She'll get about 75%-80% through the Connecting progress bar before it eventually gives her the Connection Lost error banner. She's also tried to uninstall/reinstall to no avail. It worked fine when she first got the new tablet, but failed ever since a previous maintenance update.

I can launch Boom Beach and other apps from both of my devices, but Hay Day's maintenance updates are always problematic.