Yeah same for me, also got some 20 pcs of 1142 still online.Please also make sure to check the patch release dates. iirc the 8.3.150.0is older than the 8.3.143.15 and thus may not contain the relevant bugfixes!

We have updated our 5508s to Hotfix-version 8.3.143.15. That fixed the issue for us. Would be less impact than updating from 8.3 to 8.8 ...

sorry, we didn't find a solution but only a workaround. We have replaced theFlexconnect 2800 with new 1800 APs, which solved the issue for us.

Sorry no bug# available for me. I just got this on short notice from our partner company without reference to the actual bug#

Thanks!BTW it happens only in Flexconnect mode. I was informed yesterday by our network support company that there is a known bug with 2800 series APs and Flexconnect setup, but no bug fix as of now. As we only have fielded less than 10 pieces of 280...