Pay your monthly storage rent on time. If you're unable to do so, contact the facility manager as soon as possible to let them know about your situation. Be sure to also review your contract so you know how many days of delinquency are allowed before the auctioning process begins.
Reminder: Facilities do not want to sell your items. The storage auction process is extremely time-consuming and stressful, so managers will be happy to work with you to come up with a solution. Communication is key!