Z9X Pro Stuttering

Hey guys, I'm a brand new Zidoo user and just bought a Z9X Pro to couple with my new Sony OLED. Hoped to be able to play my 4k remux's but noticing an issue where some movies will stutter and I can't figure out why. They play just fine through Plex. Contemplating whether I need to return this and just use a Shield Pro. That option sucks cause everything I've read says Zidoo is superior but so far that does seem to hold true.

Any suggestions on how to address this? I've tried everything I...

Z9X Pro Stuttering