Thank you very much for your additional info, that seemed to be the cause of problem.
So I have 4 different levels to start with, two of them have asteroids fields.
level 01 have 4 asteroid fields that spawn one after other is gone, the first asteroid field takes 13 sec to spawn. (Randomly after some few minutes of play time client crash)
level 02 have 1 asteroid field that spawn immediately begin play. (Randomly when traveling level client crash)
I broke the scrip for asteroid field bp, and with the test client didn’t crash.
So the problem as you suggested in [link text][4] had the key. Hierarchical Instance Static Mesh is causing this issue. I’ll try to reduce bounds, or not spawn but placing in level to see if has a solution. Before I switched UE4 ver 24 to 26 it didn’t present this problem.
Thank you very much Kehel18 for your interested in helping me out. You saved me lot of time and probably breaking lots of stuff in vain.