We are having issues with the dropbox website loosing connection and saying it can not respond. This happens for around 10 machines on the network at the same time however it is not constant. We have had days where it works fine and then some days where it will drop out for around 30 minutes. Nothing is being blocked and disabled the Anti-Virus as a test and does not look to make any difference. I have also changed DNS to 188.8.131.52 and tested that and again no difference.