The issue is when the other 3 users are working they receive the error (attached). Their QB will freeze until I log completely off and sometimes I get kicked out in the process. It is very frustrating especially since one of the main users works from home and on the road. We have tried everything to stop this glitch from happening. I have spent countless hours on the phone with customer service. We have had QB rebuild the company file, verified only the server is the host computer, created a completely new user for myself, paid a 3rd party to start a new company file ($3,000.00), paid IT company to redo our network and  verified that all the computers on the network have the correct requirements. I have emailed the developers as well and our CSR several times. His final suggestion was rebuilding the company file and still we are having the same issues. Has anyone found something other than what I have listed that is causing these issues.