yes,,, dhcp is no issue about IP assign service...
I requested meraki support team...and then meraki team checked.. but it just resolved through firmware upgrade from MR26.7 to MR29.5.1.
but I didn't understand why was resolved through upgrade because MR36 AP is already service operating MR26.7 in other network group.... and I tried to find bug issue in MR26.7 release note.. but I couldn't check..