When I experienced this issues a month or so ago I think it failed because the timeout was too small. This time it failed quickly from last night to about 9am and now it is trying to compile for the duration I put in which is now 300. If you are not seeing many failed attempts on the servers it may be a network related issue or your firewall is blocking my IP at times because of some rules or something or my user profile. Can you see my attempts on your logs using either my username or IP?