Is it the Lake software that looses connection to the LM44, or does the dLive Surface drop connection to the MixRack?
There is no sleep mode for third party data and your use case is intended operation.
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You should not connect both the surface and the mixrack to the same network at the same time. This will cause issues like you are seeing. Any needed data transmission between the surface and the mixrack is carried by the GigaAce connection, including the network data. It doesn’t matter which device you connect to the network, but only connect one!
But you are connecting both the DM0 and the CTI1500 to the same network using the “network” ports in each device, correct? If you are, then you need to disconnect one of them from the network. When you connect both, it creates a cyclical connection that causes overall network instability. This is because you have connected both devices to the network, yet the CTI1500 surface is also getting the same network data through the GigaAce connection too. Disconnect either the CTI1500 or the DM0 Mixrack from the network and I think you will find the overall network stability improves, even for other devices like the Lake system.