ATEM TV Studio - ethernet drops

Hello,
I'm a new user of the TVS (and a newbie in this kind of production altogether) and have had some issues with the switcher. In general it seems great, but one issue is crippling our production:
The Ethernet connection drops (light out on ATEM) and the control software disconnects. This has happened twice now during our multi-camera production and essentially locks us down on whichever feed happens to be live. The only solution to bring the Ethernet and control back online is to off/on the ATEM TVS from the power supply.
Any ideas as to why and how to solve this? The ATEM is lying on the table (heatsink up) as we do not have a rack yet, so could it be over heating? Last time it dropped after 20 min.
Thank for any help.
I'm a new user of the TVS (and a newbie in this kind of production altogether) and have had some issues with the switcher. In general it seems great, but one issue is crippling our production:
The Ethernet connection drops (light out on ATEM) and the control software disconnects. This has happened twice now during our multi-camera production and essentially locks us down on whichever feed happens to be live. The only solution to bring the Ethernet and control back online is to off/on the ATEM TVS from the power supply.
Any ideas as to why and how to solve this? The ATEM is lying on the table (heatsink up) as we do not have a rack yet, so could it be over heating? Last time it dropped after 20 min.
Thank for any help.