I think that message is often spurious.
I see it, but a channel scan indicates a pretty good RSSI and LQI on Channel 20 (I have a second zigbee coordinator on Channel 15).
I agree I have zero zigbee issues and honestly never on the zigbee status so I am just letting the warning live there happily on its on.
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Just to add a "me too post" to the "dismiss" has no impact. No zigbee issues, but warning showing.
Running C8 Pro and 2.4.0.148
RSSI and LQI look good, but I do have 2 channel 20s. No idea why.
Another "me too" post, to hopefully prod some movement into dismissing this message.
Migrated to the C8 Pro a few days ago from a C8 (excellent migration, went flawlessly) and immediately discovered this message. Running on Channel 20, not having any mesh issues, but cannot dismiss this message. Clicking dismiss does nothing.
Running v2.4.0.151.
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Hopefully fix coming in 2.4.1, I think I saw mention of it being looked at over in the beta section.
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Thing is when one analyzes their local WiFi environment we find a Wild West mess of signals.
The power limit on ZigBee Ch 26 is 12. The max is 16. So not to bad of a hit. Why I am on 26. 12 is more than enough plus there are some strong signals already on 25.
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And another confused user. 
2.4.0.151
Alert always on, dismiss does nothing.
Channel scan (when it occasionally works...) shows:
Is that Weak? 
Everything seems to be working fine.
Unless I hear otherwise, I feel this is just a IUI issue, ie: the link doesn't work. Not a big deal.
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If your Zigbee network is working fine, then you should just ignore that warning. The Dismiss feature used to work. Sounds like it is just a bug.
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I've scanned this entire post but didn't notice anyone experiencing this issue when Zigbee is DISABLED. In my case, Zigbee is disabled - I don't have any zigbee devices. Yet I get this warning as well, and am unable to dismiss it. I did enable Zigbee and set the channel to 25 as once post suggests - that didn't solve the problem. I've re-disabled Zigbee and guess I will just tolerate the warning.
From my understanding, this is just a message and not a diagnosis of an issue. It doesn't scan and see a weak channel, it is just warning that ch20 may not be the best choice.
I agree that it should be able to be dismissed, hopefully that gets fixed soon. But it isn't harming anything by being there either and it isn't an indication of a problem.
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You are sure it took the change to channel 25? Changing the channel should clear the warning.
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As of the last update this can be dismissed now.
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2 channel 20?. You may have an orphan device which doesn't know it has been unpaired.
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alex1... I thought I should be able to find one... I only have 29 devices. I cannot. How do I best go about it please?
