Region : Argentina

Model : TL-MR3220

Hardware Version : V2

Firmware Version :

ISP :

I have recently changed from a modem internet connection to a 4G connection
Now I find that if I move more than about 9 metres (27 feet) from the router , I can not connect.
My computer shows that router signal as fair but wont connect.
If I am connected at the router and then move away over 9 metres the router will stay connected for about 5 minutes or until I use the internet and then disconnect

Does anyone have any advice and perhaps an indication of the max distance that the router should connect to the laptop please?: