Workstation not connecting to server

I have QB Premier Plus 2022 Desktop with my desktop being the server and 4 other workstations.  At least once a month the same workstation will lose the company file.  None of the other workstations have ever had this problem.  Most of the time I have to have a phone call with the support team that usually takes about 2 hrs.  Occasionally, I can completely shut my computer (server) down and then bring it back up and restart QB and that workstation can resume working.  When I do have to call support I tell them we have this problem all the time and can just about tell them the steps we have to do to fix the problem.  They always go through a bunch of other steps before the very last step they try is what I have tried to tell them.  They always say that if that step doesn't work then there is a problem with one of the computers.  The step always works.  It has something to do with creating inbound & outbound rules. I really need someone to help me fix this permanently because I do not have time to do this every time.

Thank you,

Andrea Johnson