I am running RDS on one Windows 2012 R2 server for all RDS services. I have a group of users from other company using web RDS to access the published application. Randomly, they all are getting disconnection on the same time and reconnect to RDS server.

 Since I have narrowed down this issue only happened to one particular company, they said it could be the group policy from that company hitting the computer when it runs the refresh. I have asked that company to run a GP results and couldn't find if there is anything related to RDP connection like enable or disable RDP.  I also checked on the computer local policy that the registry for fDenyTSConnections is 0.  The clients are running on Windows 7 Pro machines.

Any suggestion?