Too much lag when i type korean

When i type korean little bit long without space like ㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋ
Keyboard app stops and shutdown.
English does not have this problem.
App version is latest version (9/12) and this problem occured about 10 days ago.
Not only my device, many korean users have this problem. (in playstore review, there are same people who told like me)
Plz fix it T_T