I'm with Orange using a new Brightbox. On speedtest.net, my readings are roughly 13-15mb download, 1mb upload.
But the problem is when I am trying to either download a large file, or stream (e.g. bbc iplayer, youtube, vimeo etc), the file/stream starts quick, but after a minute or less starts decreasing in speed until it crawls to a stop.
I've tried dozens of websites, multiple computers (both wired and wireless), phones, tablets, clear temporary internet files etc. Nothing works.
Any help would be much appreciated. I've rang Orange a number of times and they have been beyond useless and an embarrassment to customer service.