@Kevin_Z Thanks, Kevin. I've just had a new router installed by cable company and was warned not to change any settings for the First couple of weeks, so will try this later.

 

I did find that if I enabled *both* adapters on the SP3 (internal and T2U), I occasionally managed to get the speed up to 25Mbps, though still well short of the 50Mbps my mobile provides in the same location. I'm starting to think the SP3 is the problem.

@tonylinde I just tried this after struggling forever and it miraculously worked. First of all you need to safely take out your adapter and click on uninstall for the driver BUT choose fix driver instead. Before plugging in the adapter make sure that you disabled your WIFI and will not automatically connect to any once turned on. Then you should turn on the WIFI and go to the network connection within the control panel. Here you SHOULD see two WIFI - Disable the one which is NOT TPLINK and enable the one which is TPLINK. After doing this the 5G network showed up and I was able to connect!! I hope this works for you!