Some thing similar happens to some other guys. (on got German and the other one Hebrew., but I can not find the post . I will try to find the post. It ended that one of them did a hard reset but I do not know the outcome.
So I will come back on it if I find the post.
Back to you . When did this start. Do you know if you in that time frame installed an app which could trigger this?
I don't know when it started,it was here for a while but yesterday is started bothering me,i will check the keyboard after every app i open,so i guess i will find the problem