We have just changed from L3 roaming to L2 Bridge mode and we are seeing this in both modes. We did have 2 DHCP servers configured, we have recently removed the second one and the errors have reduced but not gone away completely.
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I'm not convinced that this is a DHCP server issue, as we are seeing this on Corporate and Guest SSIDs both of which use different DHCP servers - Corporate a Windows server and Guest DHCP is running on a Firewall.
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