Suddenly unable to connect to remote PCs

I have been using TV successfully for a while now for private use.
But I have suddenly encountered a problem I can't sort out.

Logging in to the TV software all of my computer's are showing online.
But one of my computer's won't connect.
If I try to connect, nothing happens. The computer just jumped to the top of the recent computer list.

The strange thing is that this only happens when the computer have been idle and locked itself.
If the wife or kid is using the computer, I'm able the connect without any problem.
I use TV and VNC parallel, depending on what I'm doing. And VNC is the same. Able to connect when computer is in use. Unable when the computer have been idle, and locked.

So I'm assuming there is a Windows issue, but can't sorry it out. Just happened over night. So don't know what have been altered.

Is there anyone that have any idea how I can proceed to fix this issue?

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