I am also facing the same issue. If the flex connection loosing the vlan's then how it integrates with WLC. i have 5 Aps in my network. i have seen the same issue at the time of the AP integrated with the WLC. Out of 5 APs are integrated with WLC and remaining 2 APs are rebooting.
if we loos the flex vlan mapping the how those 3 APs are integrated.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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