I am having the same issue. I created reservations for 30 chromebooks and usually during the day anywhere from 3-6 chromebooks can't connect. We are a school setting and when the student logs out of the chromebook a message pops up and asks the student to pick a network. It the chromebook sits it may connect, but some will not connect at all unless I delete the reservation and re-add it. I am getting ready to deploy 150 more but I can't deal with this. We need the reservations for tracking, but I will add static numbers if necessary. Any suggestions?