Flex AP with strange EVT-5-NTC d0 Beacon events

Hello Support Community,
I am experiencing some strange behaviour with an AIR-LAP1142N-E-K9.
It is running with CAPWAP on a CT5508. Firmware; 7.4.110.0
It is one of many FLEX APs on that controller and I havent seen this behaviour on any other yet.
The user on site have a very slow connection process. It can take up to 45 minutes untill they actually connect.
The AP log shows alot of this:
(controller) >show ap eventlog ulmipap01
AP event log download has been initiated
Waiting for download to complete
AP event log download completed.
======================= AP Event log Contents =====================
Feb 17 12:16:26.176: %EVT-5-NTC:
d0 Beacons set state ds 2020105 0 1 0 0 0
Feb 17 12:16:26.211: %EVT-5-NTC:
d1 Beacons set state ds 2020105 0 1 0 0 0
Feb 17 12:16:26.212: %EVT-5-NTC:
d0 Beacons set state ds 2020105 0 1 0 0 0
Feb 17 12:16:26.301: %EVT-5-NTC:
d1 Beacons set state ds 2020105 0 1 0 0 0
Feb 17 12:16:26.301: %EVT-5-NTC:
d1 Beacons set state ds 2020105 0 1 0 0 0
Feb 17 12:16:26.394: %EVT-5-NTC:
d1 Beacons set state ds 2020105 0 1 0 0 0
Feb 17 12:16:26.394: %EVT-5-NTC:
d1 Beacons set state ds 2020105 0 1 0 0 0
Feb 17 12:16:26.510: %EVT-5-NTC:
d1 Beacons set state ds 2020105 0 1 0 0 0
I could not find any reasonable explainations of this message. Surprisingly google also hasn't seen this particular event message yet.
Before you ask: Link Latency is fine for the most part:
Current (mSec) Minimum (mSec) Maximum (mSec)
Link Latency
6
24
214
Data Latency
<1
<1
<1
And help is greatly appreciated.

At the moment the user tell me the connectivity looks good.
But there are still those %EVT-5-NTC eventlogs on the AP every few milliseconds.
(controller) >show sysinfo
Manufacturer's Name.............................. Cisco Systems Inc.
Product Name..................................... Cisco Controller
Product Version.................................. 7.4.110.0
Bootloader Version............................... 1.0.16
Field Recovery Image Version..................... 7.0.112.21
Firmware Version................................. FPGA 1.7, Env 1.8, USB console 2.2
Build Type....................................... DATA + WPS
System Name...................................... hdhi402a0ws01
System Location..................................
System Contact................................... **************
System ObjectID.................................. 1.3.6.1.4.1.9.1.1069
Redundancy Mode.................................. Disabled
IP Address....................................... ***.***.***.***
Last Reset....................................... Power on reset
System Up Time................................... 2 days 0 hrs 46 mins 35 secs
System Timezone Location......................... (GMT +1:00) Amsterdam, Berlin, Rome, Vienna
System Stats Realtime Interval................... 5
System Stats Normal Interval..................... 180
Configured Country............................... DE - Germany
Operating Environment............................ Commercial (0 to 40 C)
Internal Temp Alarm Limits....................... 0 to 65 C
Internal Temperature............................. +44 C
External Temperature............................. +24 C
Fan Status....................................... OK
State of 802.11b Network......................... Enabled
State of 802.11a Network......................... Enabled
Number of WLANs.................................. 6
Number of Active Clients......................... 1285
Memory Current Usage............................. Unknown
Memory Average Usage............................. Unknown
CPU Current Usage................................ Unknown
CPU Average Usage................................ Unknown
Burned-in MAC Address............................ 44:D3:CA:B7:5E:A0
Power Supply 1................................... Present, OK
Power Supply 2................................... Present, OK
Maximum number of APs supported.................. 250
When you say "other log info from the wlc" do you mean something specific? I have about 1000 clients on it. So there are quite alot of syslog messages going around.

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