We have MR-55 in our environment, we have DHCP scope on a L3 switch, I upgraded to 26.7 and suddenly started getting so many logs like client declined IP address, every client would decline about 10 to 15 IPs and than take one, so support team suggested to role back to 26.6.1, in 26.6.1 a lot of 2.4 Ghz clients face issues, it works and in a day or 2 without any changes any where it stops working, 2.4 Ghz clients are not able to associate only on the network.
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