Did you get this fixed?
This has been happening to our server from Thursday last week. I have put two support tickets in and have got rubbish replies back, I guess they have not even looked at our server.
What we are seeing is after a random time the server just drops from Steam but is still running from what I can see in the web interface. Last night I just left it and put a ticket in and just checked it now and it's showing back up in Steam !
It looks to fix if you shut the server down for a few mins then re start may be two times and then it's ok for a random time. But as it is doing this a lot it's unusable.
Some other strange stuff is also going on with the TS server. It would not let us connect then a few hours later just started working on it's own.
As there are a few of us on the server we have run up another host with another provider and that is working very well, So unless it gets fixed soon will just switch to them.