This may have been reported before but I was downloading something using the browser
to do the download. The download initially started but then seemed to have stalled.
So I used a little trick to get the download going by pausing it then resuming it again.
It's at this point that vdh reports that the download failed as a download error and clicking on the details it says: download error user_canceled.
Anyone can replicate this themselves by doing the same thing.