Xperia Z3 :: When Switching Among Words Keyboard Use To Hide And Show In A Fraction Of Second

I've found problem with xperia keyboard. While switching among words keyboard use to hide and show in a fraction of second despite of I still write text in the same text-box. It used to stay shown while I'm in the samw text-box. Also noticed it happens only I set cursor at the beginning or end of word. If cursor is set into word keyboard is still shown.

Here's video Xperia Keyboard issue: While writing this I noticed that if I push enter button on keybord for new line keyboard uses to hide and not shows up.

:loop; start "" %0; goto loop