I need to make a comment here.
I have been trying to fix this issue ever since I got my Z9S. I had exactly the same problem with my Himedia Q10Pro. Maybe it is an inherent Android issue.
The problem is that as soon as I try to play a 3D Bluray ISO file (MVC), the player starts and I can watch the movie but the remote and the device becomes unresponsive until the movie ends. I cannot make any adjustments, move forward, pause, change audio track or add a subtitle. I have to unplug the power cord and restart the player if I want to do anything else...
This is very annoying.
I tried playing multiple files from my NAS, from a USB stick or from a local hard drive I connected to my media box - always the same result.
I use the 2.3.10 firmware.
The Zidoo forum is completely silent about this problem, I tried there too.
I appreciate any input.