You may have a try the driver from manufacture of the chipset or contact support.uk@tp-link.com for help.

Can you share how did it work?

Did you change the IP address of the TL-WA850RE to 192.168.1.X? Suggest you to configure the IP address of TL-WA850RE to the same subnet of your router and disable DCHP server on it manually. I find...

Is your phone working normally when it is connected to some hotspot wifi? It seems to be a phone issue. You can restart or factory reset the phone to have a try. To change the DNS server on the phone...

Can you get internet from the router? Suggest you to check the IP address of your PC is something like 192.168.0.X. Another PC or phone can be a possible solution. The last try is to reset the router...

How far is the adapter from the router? If it is too far and signal is not good, the connection can't be stable. Besides ,use inssider to check the interference and choose a best channel for the...