Perhaps the multitude of design flaws in the apple device are conflicting with your ability to play KaW.
So this one time, I was in a queue for this new iPhone 6 PLUS. Saw guys use those 2wheel box carrier things to bring in the new idevices. Everyone flips out. 1 guy starts frothing at the mouth. This other guy was so excited that he punched this other guy in the face. Long story short, all out brawl. Everyone goes into the building. *Continues fighting* I got into this punch up with some random guy. *Walks upstairs* *Still punching each other* Then some 7 foot gorilla picks me up and throws me out the window. I was sure that I was going to never play the piano again, TELL CLARICE THAT SHE SMELLS OF ONIONS. Then, I land on a pile of Samsung galaxy s4's. Thank you Samsung, thanks for everything T_T Tl;dr Apple sucks
You need to clear your cache. Easy to do. Go to desktop home screen. Double click home button (the circular one) then swipe up the windows that appear to clear cache. I do this frequently on my iPhone to maintain it ️ btw I also have a 6
Further ways to fix the issue. But first please make sure the game is at its current version via App Store. By soft restarting the iPhone 6 by pressing the home and lock button at the same time and hold them for 10 seconds, this will reset the CPU within the handset. If that doesn't work please restart the Internet connection by resetting it via settings>>general>>reset>>reset network settings. Now reconnect the phone back to the Internet again. if you still are experiencing issues only second last step is to uninstall kingdoms at war and reinstall it <---- only do this if you done the follow up steps above and failed, if that does not work please email the developers at support@athinkingape.com, please state the username and full details with screen shots so the developers can see into this more. Please get back to me if you done the follow up instructions op before you do the last step. Will be locking this now. /lock