I do not know enough about WLC CAPWAP connections to even begin to assist with debugging this. More than likely, you would have to take packet captures to see what is going on at layers 2 and 3 to debug this issue.
This type of question really needs to be worked through a support case. Have you opened a case with Palo Alto Networks Tech Support?
Please visit https://support.paloaltonetworks.com or call:
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EMEA Support: +31 20 808 4600
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Jeff Hochberg | Sr. Systems Engineer - Technical Business Development
Palo Alto Networks | Atlanta, GA | USA
Mobile: 404.432.1112 | www.paloaltonetworks.com
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Please let me know if you run into any issues with opening a support case.
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