Gray Bar and Immediately Kicked out of Room

The past Friday and Sunday, we had one player that had trouble playing in a #VF5US league room. On Friday, it was gray bar with 1 or 2 players in the room. On Sunday, gray bar/immediately kicked out if room. Both times I hosted the room, but was done at different locations (local venue and later residential). Any suggestions to fix this issue?

 

Is there a “how to port forward for dummies” instructions?

 

Thanks for the link. That website also have one for Playstation 4.

https://portforward.com/playstation-4/