Vega 64 strix crashes in final cut

Hackintosh build Mojave

Core i7 6800k

Asus strix x99 mb

16gb 3200 ddr4

Samsung evo7 512 ssd

Asus Vega 64 strix

Monitor is 4K Samsung series 7 43” tv

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My system is very stable except when I use Final Cut Pro, it seems to crash as soon as I open mp4 files or mov haven’t worked out which one is causing the issues.

The systems locks I can move the mouse but nothing responds

I’ve tried with and without whatever green.kext but still no fix.

Does anyone have an idea what may be causing it? As stated it works without issues until I start video editing