AFCI/GFCI Breakers Trip Intermittently/Simultaneously
The part where you said they all trip simultaneously and the fact they're all back-to-back makes me suspect of a bad buss bar.  Other than that there should not be any correlation between any of these isolated circuits.  It's plausible, but highly unlikely the manufacturer shipped out a bad case of breakers and the installer just happened to install them back-to-back but realistically not heard of.  Just replace or as Trevor mentioned in his comment swap the known good AFCI with known bad ones and check buss bar for burnt marks.  See what happens.