I have a Brother HL-2270DW attached to my TC via Ethernet. Every time I print the TC light flashes yellow and I lose my internet connection to my MBP attached to the TC. I comes back after the print job is complete. I noticed this on an HL-2170W I had earlier and just lived with it, but with a new printer I find it very frustrating. I'm running 10.7.3 on a MBP and the TC is 3rd gen with 7.6.1.