Actually i have a Sort of same issue at the moment with the tvs hd.
Running fw 7.2. The atem software disconnects from the switcher after a few minutes. And wont reconnect. While a hardware controller stays up and running without problems.
Sometimes just restarting the application does it (for a few minutes) sometimes i need to reboot the whole laptop again....
Running a 5 port unmanegent netgear gigabit switch with only the laptop, tvs hd and atem control panel connected.
But because I have job tomorrow with the atem set i wont fiddle with firmware now. Will wait till the weekend before going into further investigation.
So might Be related Baz..