The error that hangs the sequence is:
[9/9/2016 2:11:02 AM] [DEBUG] [Monitoring System Timed Message Thread] Adding sequence level notification: Failure while integrating ngc7331; Event 1; Frame 15 for 900s. Image has not downloaded in alloted time period.
[9/9/2016 2:16:02 AM] [DEBUG] [Sequence Thread] Adding sequence level notification: Camera timeout! No image was downloaded.
The system works fine until it downloading 14 frames. This type of problem happens about 50/60% of the sequences and the morning when I check the observatory sgp hangs. Sometimes it works without any problem.