Not sure how to search on this or if this has been discussed before.
So I finally put together my quad with the APM2.5+ and have flown it a few times and while I am flying it there is this random twitch where the quad rolls to the side just for very brief part of a second of time. During a 15 min flight it will do it a dozen times or so.
I had the same APM2.5 board on a F450 a few months ago and noticed the same sort of glitch. Its like it randomly over corrects by a lot but only for tenths of a second then back to normal. Seems to only happen when I am moving it around and not when it is just hovering.
Does anyone know what could be causing this to happen?
The DJI F450 I had it on had the 3DR 880KV motors and blue series ESCs and the new quad which is a SteadiDrone QUAD has nicer 900KV t-motors and different ESCs (the 4 in 1 ESC).. so seems related to the APM and not the equipment since the equipment has all changed and similar problem.
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Glad you found the problem.
Moral of the story : a chinese T9X cheapo Radio for 50$ plus a free firmware upgrade (to Open9x or ER9x) and a 25$ Frysky 8Ch module is much less prone to user's frustrations/issues than these expensive Futaba's or Spektrum's radios.
You haven't said what radio gear you are using.
There was a known issue with Futaba Rx's (I use these) which required an upgrade of the ArduPPM code on the board, which is a totally separate thing to the usual firmware we upload.
Once done all my twitching went away.
I also assume that you are not using bullet connectors and the like in your motor circuits.