Motor suddenly starts 30 seconds after AMP2.5 is started

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What steps will reproduce the problem?
1.plug in ESC/battery to LIPO to activate receiver/ APM system
2.
3.
What is the expected output? What do you see instead?
To activate plane/ APM2.5. 
AMP works for 30 seconds/then elevator pulses 3x and motor suddenly starts.

What version of the product are you using? On what operating system?
APM2.5/Windows Vista
Please provide any additional information below.
I am newbie to APM system and on initial install. I have followed all steps for 
installation and searched for help on DIYD issues but no help.

Original issue reported on code.google.com by edl...@bellsouth.net on 9 Nov 2012 at 10:28

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I have exactly the same problem, and really need to know what to do.

Original comment by mariu...@gmail.com on 12 Nov 2012 at 6:44

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I feel it is in throttle failsafe or flight mode but still stuck on ground.  
Let's hope somebody can help.

Original comment by edl...@bellsouth.net on 12 Nov 2012 at 6:50

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Flight mode was in Loiter; I changed to Manual and problem gone.

Original comment by edl...@bellsouth.net on 18 Nov 2012 at 10:05

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I had an unexpected startup today on the ground shortly after power up.  My 
transmitter was on and switches were set to Stabilize mode. I suspect it had 
something to do with the 1-sec and 20-sec failsafes (which I had enabled).  I 
had thought those were related to the Circle and RTL actions upon Throttle 
Failsafe (which I checked). Now I wonder if they (1 & 20) might refer solely to 
GCS/Telem failsafe (which I did not check).  Either way, I would like to see a 
better description of failsafe options in the Wiki. 

Original comment by SGT.JAME...@gmail.com on 23 Dec 2012 at 7:59

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I'm only adding to this issue (instead of starting a new one) because my 
problem happens 30 seconds after start up as well so maybe the failsafe is part 
of the problem but this one freaks me out so I can't test today like I wanted 
unless I can fix this. But my confidence is crushed as I put this on a nice 
plane that I would hate to lose to a malfunction. What happens is when I power 
up in manual mode after 30 seconds the servos start to wack out, moving 
suddenly then they stop but I've lost all manual control except for the rudder. 
This would obviouly result in a terrible crash should I have not discovered 
this during testing on the ground. If I flip to another mode even for a split 
second all control returns in manual mode too so that may help someone figure 
out what is going on. Manual control should always work in a product like this 
so unless someone can spell out why this is happening with confidence along 
with a fix I may have to take this off my good plane and perhaps try it will a 
cheap one first.

Original comment by pau...@gmail.com on 25 Dec 2012 at 4:37

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After thinking about it for a while I became convinced it had to do with the 
failsafe function and so I went back to look at those settings with the intent 
to disable the failsafe and see if the problem went away. Low and behold I 
found a newly added item for failsafe, if ground station disconnects. Well of 
course I wasn't connected to a ground station! I don't have a radio modem! 
Changing that setting fixed the problem but that ought to be automatic if there 
is no radio connected. Jeez, lots of people could crash a plane with that one. 
Glad it's fixed anyway but too late to fly today and of course it's going to be 
crappy weather for the rest of my week off!

Original comment by pau...@gmail.com on 26 Dec 2012 at 12:52