CSS106 - access via SFP problem

Hello,
I’m having an issue with CSS106 access via SFP port.
That config worked fine with old RB260GS.
This one allows 4 pings and then it drops.
scr1.png
scr2.png
scr3.png
Any advice?

vlan 666 is my management

What software version is your CSS?
My CSS106-5G-1S is version 2.8 and is configured quite different than yours. The SFP is a gigabit link from this switch to a CSS326-24G-2S in my family room. It is exclusively a tagged trunk port. The two Open Mesh ports are WiFi access points that have both a non-tagged VLAN for cloud management connectivity, and multiple VLANs that each become a different SSID on the WiFi. Ports 3 - 5 are untagged ports to end devices.