Okay, done default reset on the ZYXEL router and done a reboot.
When router is up again, i activated UPnP + UPnP NAT-T function…pressed apply, and then 1 more reboot and…
BAAM…Its working flawless as it should, 
Just to be clear… just these 2 settings is chanced in router, nothing else
Maybe someone else have this solution in front
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