I've noticed some pretty bad lag lately, much worse than usual. At times I can't even scroll across attack bar over to tactics, let alone use them properly. Playing on a Galaxy S5
Think there was a memory leak introduced in the most recent patch. I used to be able to play for hours without the game bogging down, but lately I need to relaunch app every hour or two to prevent the lag from becoming unplayable.
Same here on both a Galaxy Note 10.1 and a Note 5. The longer I play the worse it gets. Using a memory cleaner such as Fast Reboot does the trick. For a while.