Use this simple trick and play Amazon Prime videos continuously without any pause on your Mi TV 4A.
First, on your Mi TV go to 'General Settings' and turn off the screen saver feature.
Next, download and install the prime video app on your Android phone.
On your phone launch ES File Explorer, tap on APP and long press on the 'Prime video', choose the backup option and you should see the backup success full message.
Go back to ES File Explorer main menu, tap on internal storage and go to backups folder, you will notice the app.
Copy the app to a USB drive or removable storage.
Now on your Mi TV, go to the 'Security' menu and allow installation of apps from unknown sources.
Install the Prime Video app on your TV using the drive that you copied from your phone.
That's it, enjoy movies on Amazon Prime video app without any pause.
Note: Mouse and keyboard should be connected to your Mi TV.
You can change audio & subtitles using the Menu (hamburger) button on your TV remote.