Well given the long run of of issues and failures I've had with my OZ9 Zev decided to take the gun back and replace it with a new one.
The wait was quite long but I did receive a new replacement. I don't have much time on the range with it but so far no issues.
The trigger on the new one imo is no where near what it should be. After a good cleaning and a couple hundred rounds it was still gritty with several steps along it's travel. I've since swapped it out with an Overwatch Precision trigger which cleaned the feel up with smooth travel and a nice break.
Maybe I'm being to critical but when I shipped Zev my old OZ for replacement it had one of their higher end optimized match barrels in it. The replacement has the pro barrel in it. The optimized barrel has several enhancements. I know the optimized barrel in my old one was a tack driver, not enough rounds through the new one to see if it has the same potential.
I still believe Zev is on to something with their design but it needs more refinement, especially for what the OZ cost.