Thanx. I figured it out. My bad I think. It was an MP game I started. After starting an SP game seems stable so NP.
PS. I have four 7D2D directories in steam. Original latest stable and 3 renamed for mods so JZ true survivor is not the default dir. Makes it easier to manage different mods, Just copy original and rename it in this case 7 days to die-jzmod. Then apply mod to renamed game dir and bobs your uncle:)
Cheers.