Upgraded to 8.5.3 from 8.5.2 a few days ago. My Emporia Energy Smart plugs became unreliable, 99% of the time they were not connected. They showed Disassociated in the Wireless Client page. I rebooted the Max Transit just to see if that helped, it did not, then I rebooted it again and had it boot up 8.5.2 and they are all working again. Bug?
My Max is hardware version 2. Its the CAT-18 Single Modem Model.
This sounds similar to an issue that I have seen with 8.5.1 8.5.2 and 8.5.3:
One solution seems to be changing your DNS settings:
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My problem is not related to DNS. They will not associate to the AP no matter what I tried over a couple days of testing. Downgrading to 8.5.2 fixed it. -Bill
Make sure you open a ticket
We see similar issues with IoT devices, but rebooting the router almost always fixes it.