Help Needed - ATEM Mini Pro - no image output to PC

I have a Sony Alpha camera connected to a ATEM Mini Pro, which I use for video in Streamyard and Skype.
A few moths ago image started disappearing randomly. Skype hungs every time it happens. Same thing happens in Streamyard (although the app does not hang).
When this happens, the image is still ok in the HDMI output, which means the image is getting to the ATEM unit fine.
I have updated the ATEM firmware to the latest build.
I am thankful for any help.
A few moths ago image started disappearing randomly. Skype hungs every time it happens. Same thing happens in Streamyard (although the app does not hang).
When this happens, the image is still ok in the HDMI output, which means the image is getting to the ATEM unit fine.
I have updated the ATEM firmware to the latest build.
I am thankful for any help.