@Kevin_Z 

Hi there Kev, 

As your previous customer has stated, 

I am also having the same issue. 

What is the current network diagram?  The router is connected to a local third party 4g provider via a sim card on a monthly contract. 

How do you connect these devices together? 

I use two phones which are wireless and an xbox one which is hardwired via an ethernet cable

What is the operation mode of the TL-MR6400?

Look Kev, although I understand the basics of wireless routing, I'm not entirely sure that I quite understand your question. We have still answered below to the best I can, I hope this helps. 

The purpose of us having the Internet is to watch movies and to play on the xbox 

What is the led status of the MR6400 when connection drops out?

The Internet status led blacks out for a short period of time. 

Kind regards

Steve 

@MyScreenNameIs

I didn't really understand what was being asked of me either @Steve44 ! I thought the answers could be found in my original post tbh.

I use the TP-Link as a simple modem; no DHCP nor wireless AP set up on it. It sits with its only connection (wired) to a router that runs DHCP. I have my own DNS, the IP of that is configured in the router. I have also adjusted the MTU (after trial and error with ping) on the router to 1378 to try and resolve these 'time outs' I'm getting. It's better but not perfect, it has good days and bad days. I can go days without having to boot but then maybe have to boot 3 or 4 times in a day. As I said, nothing else seems to resolve the problem. There are no errors reported anywhere.

I'm not normally near the TP-Link when this happens so I can't always see the lights, but when I have been able to see them, there is nothing seemingly wrong. All lights are as they should be - it's as if the TP-Link has simply stopped (and the web admin screen shows no data traffic) It is most strange, I'm guessing (and this really is a guess) ISP related (maybe due to CGN???)