Well I was not able to find DOS setting on my router. But on forum I have found that maybe this is it:
I have disabled it and recreated first node on my DSM and Docker and whoa 
Can believe it that this was the issue (maybe not) because this started by DSM update and did not go away after router change and tried lot of settings. I have tried even remove all NAT port FW rules and keep running only one node on DSM and one rule on router (still issue).
Finally I have Two Greens!!! 
Thank you everyone for help and cooperation. Much appreciate 
Wigo