Servos (channels 5-7) go silent after working for ~10 seconds

So ya, finally got my SW all built.  The system is built like this:

(EZUHF > ppm sum out to > APM2.0 (powered by 5v bec on output8) > servos (chan1-7)

So ya, on bootup all 4 wing servos work fine, but after 10-15 seconds only channels 1-4 continue to respond..... (enough time to acquire GPS lock??)

Whats goin on?

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Sorry, I ask all these questions because I don't think it is a coincidence that it's 1-4 working, and 5-7 not working. Those channels are handled differently, by default, in ArduPlane....

Mike, you're amazing!  Everything works perfectly.  I know this seems a simple fix for you but I wouldn't have found it for a long time.  I also just physically reversed the servo and the flaps are looking great.

Thanks so much!

Hey Adam, fantastic. Make us a video sometime, and share info about your build in My Projects so others can repeat and build off of what you have done, if you find the time. 

Actually, with so many control surfaces, once you feel you have it working well, this would make a nice blog entry, too.

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