As the software is cloud based, a stable internet connection is crucial for the optimal performance of this software.  The most common cause for software to hang and freeze during normal operations outside of the image capture process is due to internet speed.

See link  https://desk.zoho.com/portal/boxmed/kb/articles/computer-minimimum-specifications  for more information on minimum computer and internet requirements.  

 If you are unsure about your internet speed, visit website www.speedtest.net and click Go

Your internet speed will show up as follows.  You require a minimum of 10Mbps Download and 10Mbps Upload.