Don't ask me why this works for me but if I have the keep alive turned off and the start zeros turned on I get an output that stops the test pattern and keeps the port awake.
mine doesn't work that way, but I'm using some chinese RGB controllers... $6 versions. the V1's don't ever stop colorwashing no matter if I have keep alive on.. the V2's will stop at their color until the orange LED keep alive goes off. I haven't tried linking the multi-controllers through the Lynx Express yet.
Think I'll do a little more testing with the multi-controller items, see if the Lynx Express helps the V1 controllers any.
What RGB controllers are you using that colorfade on loss of signal?