According to my alert history the AP15 is offline everyday, twice a day, for a few seconds. It's always once in the morning and once in the evening. Usually 12 hours apart. For example if it's offline at 1:49am it will be offline again around 1:49pm that same day. Any ideas why it's doing this? Is this related to ARM?
@CCidAruba ARM will not take an AP offline. DNS could be having issues, it does not sound like your ISP would take it down that often. You could open a support case and have them look into what is going on.