Noticed this happening on my device whenever I play Tower of Magic stages and not really any others.
Also, for the longest period of time, the connection to Google Play is constantly the major culprit of what’s slowing down my game. There will be times when I can do something minimal like hitting the alliance tab to check out the chats, before any screen pops up, the game will halt, until perhaps 15 to 20 seconds later to try to sign into Google Play, and if and when it finally connects is when I can proceed to actually do anything in the game.
Time is valuable, your finger’s muscle memories/reflexes tend to want to do several things in sequence and move on to the next, but the slow down caused by Google Play sign in very often causes the incorrect parts of the screen to be tapped, most often would be one of the many pop up purchases.
The game version in the past have not depended this heavily on being synchronized with Google Play as it does now. There is also still quite a bit of the graphical glitches that has some words on the screen (mostly energies display, in-battle item counts, alliance member names, Titan HP, War progress, etc.) are showing up as incomplete, and most of the time a few auto farmed stages will solve the issue (only for it to happen again the next few times you boot up the game). Still kind of annoying though.