So apparently you are on FTTC (fibre to the cabinet ) and have had a BT ‘tech’ , who are not ‘skilled’ in the vagaries of the Openreach network, giving your home setup (what they are trained in ) a clean bill of health , and saying the fault is external , and an Openreach engineer doing some preventative measures (like changing the port in the fibre cabinet ) but saying the external network is fine , at this point you may say someone is wrong , BT and Openreach can’t both be correct .
There is a problem , search ‘Rein and Shine’ broadband faults if you want , but basically Repetitive Electrical Impulse Noise , and Single High Impulse Noise Event (or words to that effect ) are basically caused by faulty electrical devices, faults that don’t necessarily stop the device working , for example, a central heating/water pump , when they switch on , they create a large amount of electrical ‘noise’ that needs to be suppressed, if that suppression fails the pump still works but the electrical impulse causes your broadband router to lose synchronisation , it regains sync ( but you notice the outage ) and the next time your heating /water pump switches off and on , the same thing happens …..this isn’t just central heating pumps , cheap Chinese Xmas tree lights , and many other household appliances can cause this , in fact it isn’t necessarily in your home , it could be a neighbour’s home , there was a famous case where some person in a village had an old TV , when they switched it on , the electrical noise was such an intense ‘noise’ that pretty much the entire village broadband dropped out , this ‘noise’ isn’t audible, you can’t hear it .
Obviously I can’t say it’s this , but it can’t be discounted either, and if it is something like this it’s not really your providers ‘fault’ and takes considerable effort to locate .
