I’m going to shut this one down as I can answer the question for you and save a lot of speculation.
There’s a bug in the network firmware and it’s been there for a long time. When the error condition is encountered the card resets and that wakes the unit. It’s a universal error and has the ability to cause any unit to wake up. It’s happening more often on Bartok due to a couple of differences in the communications between the FPGA and network card.