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.
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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
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We see similar issues with IoT devices, but rebooting the router almost always fixes it.
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I just installed 8.5.4 RC1 and that fixed the issue with the IOT devices.
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Glad to hear your issue is fixed. Sadly, mine is not.
Upon updating my Balance One to 8.5.4 beta 1, and again updating to 8.5.4 RC1, one of my IOT devices lost connection, and could not be revived by powering it off then back on.
The only solution was to toggle DNS Caching OFF on the peplink, then toggle it back on again.
I reported this extensively with Packet Captures but it seems PepLink can’t fix the bug.
Frustrating - seems like a basic feature like this should work, and bugs should not remain unfixed across multiple versions. 
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Its odd that flushing the dns cache would fix a connection to the router issue. Would make sense if it would connect to the router but then not connect to something on the internet.
tag this thread/your ticket in the rc1 thread?
Unfortunately I never opened a ticket.