I'm a sysadmin and some of our users utilize dropbox. dl.dropbox.com for sharing files. dl.dropbox.com will eventually serve a file, but on any attempt, it could take 30 seconds or longer. Sometimes, it will just time out before dropbox serves the file.
I have tested this on another network with the same result. Notice from the network analysis in the screenshot the loading time is "waiting for server" not the actual content download.
Is dropbox aware of this issue? Is anyone else having this problem?