Well things have moved quickly since I posted earlier today. Got an appointment this afternoon, the engineer has been and gone!
He changed the connectors at the box end, replaced the 13 year old splitter at the house end and re-made all the connectors there.
He did say that if it goes again, then it isn't the modem or the connections but will probably be the amp in the network box.
Here's hoping that things are sorted......
And thanks for the welcome Ramrod
