Thats odd... Well my screens time out if I don't use them...

In the demo I have set up it is all static and I used the IP... no issue that I know of.

I tested it in the field with a friendly name and it worked for several hours... hmmm. Send me the config and also any relevant info about the network...
Type of router
If there are switches
Where stuff is plugged in Physically and IP.
If you have a remote management port to the network, and you don't mind me looking, include it.
I would need the WAN IP too if I was to do that.
etc.