I am running a Windows 2012 RDP Server, I have a number of users from varying locations connecting to this server using RDP. Clients are running a mix of Windows XP and Windows 7 machines.
I am getting a lot of complaints that the sessions are freezing/locking, this happens to me as well. This problem seems to vary some users tell me that it freezes/locks up after 15 mins and others 30 mins, I have done tests from my machine and I can go up to 2 hours without my session freezing however it will eventually freeze.
freeze = leave session for some amount of time without activity and you come back to the session which is a blue screen, you bring the session to front and you have to wait about a minute or so to get your session back, sometimes you are required to enter username and password as well.
I don't think it is a server settings as the times seem to vary so much, I did do some googling and there was information saying to un-tick audio sharing on the RDP client which I did and things did improve for me, that's why my session doesn't freeze for 2 hours or more, I also had the same problem where it would freeze after 10-15 minutes