@ShmenI There is very limited support on this forum. I actually had a couple of email exchanges with a couple of TP-Links support technicians and they even never replied to the last email I sent...

@SalmanSyed Try what I did to resolve my issue, which was similar to yours. In your QoS settings change the bandwith to the one by your provider for both upload and download (you can include a number...

Here's the update. I don't know why switching the cable worked, it triggered something somehow... then it stopped giving good speeds to the dock. I was able to make it work once again by swapping...

@oroechimaru You don't need the Tether app for QOS. Type your router's IP address in any browser on any device and you have access to all of the settings. 192.168.0.1 or 192.168.1.1 is all you need.

Maybe I spoke too soon. The issue is back even with the new cable from the modem to the router. I'll keep the thread updated if I find a fix again.

@mc_marto I just fixed the problem. The whole issue was the WAN connection cable. I was using the modem supplied CAT6 cable. I just decided to use the CAT5e supplied cable for the modem to router...