Hmm, that's strange... is it only happening for CK, or do you have the same problem with other Ren'py games?
Unfortunately, Android and Ren'py sometimes don't play well together. Some people have had luck adjusting their battery settings, some people report success after powering down their phone and booting it back up. Perhaps one of those solutions will work for you?
Sorry I can't be more help! It's an issue with Ren'py and Android's interaction and I can't do anything about either of those kits :(