Things do sometimes go wrong between the master socket and the extension socket [and the extension socket counts as your own wiring, so not Openreach's responsibility, on your side of the faceplate].
I had a similar experience, when I'd had loss of connection and the engineer said it was likely something in the extension wire.
In my house the extension wire is built into the fabric of the house and cannot be repaired, so ever since then my router has been plugged into the mastersocket.
Very inconvenient, as there's no room for the computer beside the router by the mastersocket.
Staff will be on here during the day and may run a test, but anything just to the mastersocket will probably show no fault.
Check back on here during the day.
Gliwmaeden2, a fellow customer.
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