For the last few years I was using a BT HomeHub 5, but that only works with BT. I also had a BT modem with a Tp-Link router that was fine when I was with BT.
The new ISP originally gave me another Asus that was limited to 2.4Ghz. This had the same problem, though it was perfect for the first two days while I had that temporary login, before they made that switch I mentioned in the original post. Everything changed in 10 minutes when that change occurred.
I am really doubtful that the router is the problem, but it may well be the wifi settings for their setup. Perhaps there is some obscure setting that is causing problems.
Edited by charlestown (Sun 19-Mar-17 09:04:46)