I have Plusnet fibre to cabinet speed problems that Plusnet aren't even trying to understand.
I tend to get about 40Mbps speeds downloads 10Mbps uploads. For several months during late evening /early hours of the morning my speeds fluctuate and average 5 or 6 Mbps download. During the week daytime my speed returns to normal. Sometimes but not always my telco line can be noisy too.
Can anyone suggest why the problems occur mostly through the night?