I currently don't own an M9 Pro, but I haven't heard that much about freezing with this tablet.
One thing you might do is look at which apps you are running or components you have turned on when it happens.
On my M7 Pro, it happened when I was using my external SD card. I tested the card in Windows and found out it had errors and fixed them. When I returned the SD card back to the tablet...problem solved. I also format all of my external SD's with NTFS instead of FAT32. I have fewer problems that way.
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