Problems similar to those I have endured for months now, despite several discussions with BT Engineers and repetitions of suggested reset actions, etc., etc.
We did initially find that the extenders supplied originally were 200mb. BT send me a pair of 500mb extenders free of charge.
Other than that, we are repeating the same rigmarole every time I talk to someone from BT
The 500mb extenders did improve things a little bit, but my belief is that my property is at the end of the line and the signal has become weaker owing to addition of cnsumers between the cabinet and property - a distance of approximately 400m.
The performance of my BT TV with YouView box does vary and is particularly bad at weekends.
Curiously, my BT Infinity internet doesn't appear to suffer from weak signal strength, although to be honest I don't have high demands on it, such as downloads and online TV, etc.
I can only award BT 1 out of 10 for Customer Service and o out of 10 for operation of their Complaints Procedure. If you sense that I am miffed - dead right! Fed up of paying for services I can't use.
