I have a zenbook as well (not the same model) and I only had problems with Windows. When coming back from suspension it would be hot and the screen had like white fog on the edges. I tried to fix it but with no success. Frustrated with that I decided to give Linux a try and never had that problem again.
I assume you changed the ssd, I didn’t know that was possible, I thought it was soldered to the motherboard. Is it possible you received a faulty drive from WD?