I am attempting to use an arducopter v2.6 with firmware v3.2.1 and APM Mission planner v2.0.23 running in Ubuntu 16.04. When I arm the device through APM mission planner it waits about 10 seconds before disarming. I believe that I have disabled all of the failsafes as well as the auto-disarm so I'm not sure what could be causing the flight controller to disarm itself. For what reasons can a flight controller board disarm itself? Is there a way to figure out why it disarmed using the log file? I have uploaded mine for reference. Thanks!
My APM 2.6 does an automatic dis-arm if there is no change of positions of either joystick for about 7 or 8 seconds. It can be somewhat disconcerting to the pilot, but I think it was purposely designed in as a safety feature, and I have not seen anywhere that there is a way to disable it.