I have 2 HDS live graphs and active target. All have been updated to 25.1 software. Both graphs work fine up front hooked directly to the AT in both ports. I put either graph in the back with a brand new Ethernet cord and get no source after about 20 min. I can power it off and back on and it works for another 20 min. Graphs and AT are hooked straight to lithium battery and receive constant 13 volts.