In April I reported that my ASI071 has this issue.
Which was then admitted by Sam.
Last week I purchased a 1600MM-Cool.
It has the same issue.
If after 30min 12V power only and a running fan, I connect to my laptop, the windows driver stops the fan immediately. When connecting to the camera it shows the sensor temperature at room temp.
So apparently it does not affect the TEC.
If after a session you switch of your laptop, the fan will be stopped. Even if you leave the 12V connected. It will not start by itself.
The issue appears only when you plug in the 12V after having been completely disconnected.
This could be a problem for remote set-ups, I guess.
In my situation this is not a problem as I rig-up in my bak-yard every time.
I am very happy with both these camera's.