On a few occasion's, I've been decelerating and notice a few jerks - which I would say no big deal. But when I look at the last higest reading on my FC commander it tells me I hit 1.13kg/cm^2, which happens when I haven't even stepped on the gas?? My mechanical boost gauge doesn't read anything near that (unless it happens so fast I cannot see it).. Any idea's what this could be??

Thanks for the help!