Im now at nearly 24 hours without a failure. This is truly a milestone and the longest I've ever gone without a restart of iTunes or having to log into and waking my computer. Since I have 4 laptops (late 2012 15" MBP HR Antiglare connected to a 23" ACD, late 2009 15" MBP, late 2011 13" MBA, and late 2011 11" MBA) all with ML 10.8.3 and updated to the latest software. Im able to do a lot of testing and this has worked on all 4 of them. BTW, the 11" MBA is my wife's. So excited, but not getting over confident....yet....but promising anyway!
2TB Time Capsule (TC) connected to a Motorola cable modem (TWC internet) and a 1TB TC in Bridge-mode hard wired from the 2TB TC.
I have 2, 3rd gen ATV's. I had to restart both of them after making the change in Netowrking to reconnect.