I've been testing the setup on the bench for my new airframe and have noticed the odd glitch in the barometric altitude. Everything is running well but every once in a while (maybe 3 times in a 15 minute test) the altitude reading is very high (in the order of 6000m). This is a little annoying in the GCS as the graph scales to suit. It does however result in a brief full down deflection on the elevator.
I have a v1o board with the BMP085 sensor. I'm running a seperate power system for the autopilot (Castle Creations BEC). I have a BMP085 that I use with an Arduino and don't see the same glitches.
Dave