I would unplug router and router cables from the router. Pull out the phone lead and then lead from the router to the phone socket.
Reconnect cables and then plug a network cable into the back of the router ( you probably were given a short network cable with the router when it was new)
If this gives you stable access to the internet you have a point to start investigating.
I had intermittent problems with my new PC - turns out it was a new faceplate installed by the phone company was dodgy. They then fitted another, upgraded faceplate with separate phone & data sockets - no need to filters all around the house.
Solved the problems - I had been threatened by the phone company that "no fault" found would cost me £120 call out charge. I said, if that is the case, I would cancel the contract as it did not work and move to AN Other supplier.
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Laptop missing network adapter - Windows .. new
Laptop missing network adapter - Windows.. new
