How many hosts are showing as having that file? If it's only one host, then obviously a problematic host. If several hosts in search results beside that blue arrow, I'd be concerned.

I am aware those that usually share mostly or only videos can be difficult to reconnect to, since their upload slots AND bandwidth might be very busy.
Personally, I don't have a great upload bandwidth capacity so when I'm uploading 2-3 videos at one time, others struggle to get other kinds of files from me.

Actually it sort of bugs me when the same host is trying to download 3 to 5+ videos from me at same time. I share over 10,000 files so .. you can probably imagine how this affects others. (if they concentrated on just one or perhaps 2 videos then they'd get reasonable speed & download them in acceptable time.)