New Modem arrived today, pretty happy it's not another Hauwei.
Much nicer UI on the TPLink as well. Simple setup to reconfigure my wifi on the modem rather than reconfiguring all my devices. I left all my ethernet devices on while I swapped the modems, everything seems to have retained the correct IP addresses so all good there.
Speedtest now giving me 30Mb/sec, a lot better than it was, but still quite a bit less than the 45 I was getting before this issue started, and only just over half the 50 I'm paying for.
Stability remains to be seen, fingers crossed!
