The whole network is falling apart, time to get a company that can do a better job than BT.
Plug in normal PN router, report no broadband at all, wait for it to be fixed.
That is the normal course of action, it makes no sense to try every model and brand of router in search of one that works.
If i had done that then I would still be without broadband, if BTOW have no idea what the problem is then how are they going to fix it? By trying out other modems, plusnet sent me a router that works, ok for some reason it failed for that day, but is now working.
Anyway, it got me a better router than the standard plusnet router.
Adrian
Desktop machine now powered by windows 10 pro, reluctantly, laptop by Linux
Plusnet FTTC