After getting a replacement for a device defect and after less than a year of using the replacement, one of the WAN ports, once again, cannot advertise more than 100 mbps. I am now going to ask for a second time for another replacement. At this point, I would like to get a refund to move to a different model as I suspect Flint 2 is prone to this specific issue according to many other posts, but sadly I cannot get a refund . I am honestly disappointed with this router not only because of the port but also because of the new wifi performance after the post 4.8.3 firmware. In rooms where I was getting stable 200 mbps signal now I am getting 1 mbps of speeds 
We’re very sorry to hear that you are experiencing this issue again with the replacement unit.
To help us better understand the situation, could you please let us know what device has been connected to the affected port that is currently negotiating at 100 Mbps?
If possible, please also provide the model of that device.
You can contact our after-sales support team at cs@gl-inet.com and include your order number, place of purchase and the link to this forum post.
This will allow our support team to better understand the replacement history and assist you.
We sincerely apologize again for the inconvenience and appreciate your patience and understanding.