Mokee 9 video record bug on nx531j

Mokee 9 video record bug on nx531j
4.0 1

Hello. Great work! More stable than 3 months ago. But I have one critical bug remain. When record video with stock or alternative app the app hangs/freeze and not respond. I use default options on video app. I think when reboot device the first time only it doing well. Next times i lost the video when kill video app because it frezee. Can you help me please?
Thanks