in campus I have virtual wlc (7.6.100) and 20 AIR-CAP1552E-E-K9 and 50 AIR-CAP1602E-E-K9. After some complaints from the clients that are just a few meters away from AP and on those AP's I don't have any clients. On vwlc everything seems fine, radio interfaces are up on all AP's. After that I connect directly on AP's that have zero clients (AIR-CAP1552E-E-K9) and I noticed on sh ip int brief that both radio interfaces are status up and protocol down.
I try to shut and no shut int do 0 and int do 1, didn't help. After reloading AP, everything works fine. It happens for a some time on different AP's (always 1552).
Make sure that you are running with latest version and If your all AP's are in flex-connect mode then make sure your connectivity to WLC is fine Or not, becasue this issue seems connectivity between AP1552 - WLC has some issue.
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