Our raid bases have an idle time-out. If you do not actively raid the base for X minutes (currently set to 20 min) the base will revert to being public and you will have your lockout timers. Keep in mind this idle timer does not count just being in the bubble, but you actively damaging the base with explosive damage. If you stand around for 10 minutes sorting loot, then teleport home to deposit it for another 10 minutes, then return to the base ... you most likely are too late. Also, going offline for a period of time will remove you from that base ownership.