You should open a TAC case to troubleshoot anything that happens intermittently.
If access points are rebooting, you should be able to see why by typing "show ap debug system-status ap-name <name of ap> | begin rebooted"
(Aruba7005-US) #show ap debug system-status ap-name Office-225 | begin rebooted
AP rebooted Fri Mar 4 20:01:15 CST 2016; SAPD: Reboot after successful image upgrade
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