Glad to find this post but sad to see no resolve. Same thing happening on our Meraki AP's. AP's are setup with vlan tagging because we broadcast SSID's for multiple subnets for public, guest and corporate networks. Each with different DHCP servers. All do the same thing and only noticed it this year since school started and hundreds of kids teachers are on the network. Many report no WIFI connection just to report back 15 minutes later that they are connected. On the wireless DORA is sporadic. Some clients take right off others timeout and takes a few tries to get a successful IP. My packet captures from a client, when the problem exists, show many DISCOVERS that continue until it either times out or finally gets an OFFER. Worked with Meraki support and they seem to think it's something in our switching. However I can hardwire the same client and DORA is instant every time. Besides no wired devices have the problem. I'm on the latest firmware but also tried an old firmware but problem is still there. Very upsetting to not have an answer when Meraki has been so rock solid performing the past 10+ years we've had them. I cannot all of a sudden have 4 non-responsive DHCP servers on 4 different subnets doing the same thing for wireless clients only. The common denominator is the AP's. If I find a solution I'll post here and hopefully others will do the same.
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