For the last month or so, I have been having very dramatic changes in download speeds when downloading files.
I know there can be some change, it is hardle ever steady but recently it has been very noticeable. Sometimes it crawls at around 50kb and I get many failed downloads as I assume it times out.

I am on 80/20 fibre.

Are there any tests I can do to try and find out if there is an issue with either my equipment or my line?