Just one thing puzzling me

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Your router must have come with its own power supply/lead. Fair enough, you haven't been using that as you used the combined modem and power supply.
Surely on FTTC you would be best putting the combo unit aside and using the router's own power supply?
My broadband basic info/help site - www.robertos.me.uk |
Domains,site and mail hosting - Tsohost.
Connection - Plusnet UnLim Fibre (FTTC). Sync ~ 56.6/14.1Mbps @ 600m. -
BQM
"Where talent is a dwarf, self-esteem is a giant." - Jean-Antoine Petit-Senn.
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Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.