Are you forcing the band steering to A band with a timeout of 1 second? that is set in the ESS. dropping connection to the internet or connection to the AP? or to google docs? can the chromebooks surf other pages when it cant get to google docs ? how many connections to the access point are there? we see that when there are over 35 (and in use) some chromebooks get kicked off with older access points (320,1020) - or schools have also run out of ip addresses