Recently was swapping a mains zigbee dimmer switch with a TPLink dimmer switch that is wifi. For the life of me I couldn't get it to complete. I have 6-8 of them and they all worked super easily and very well.
I broke my android Pixel phone about 6 weeks ago and decided it was time to replace it. That went very smoothly and I never thought about it. What I didn't notice is that the phone Wifi upgraded to Wifi 6 - my wifi AP supported it so why shouldn't it!
THe Wall device would NOT connect to the wifi 6 band. Once I determined what was wrong, I set my phone onto the 2.4G band (I coulda used the 5 as well) and the whole thing went smoothly once again.
Lesson - not all devices connect on all frequencies!!!
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Do you have a different SSID for each WiFi band? Or one SSID for all 3?
actually - i've got 4 ssid's. Each band has an 'xxx2.4' or 'xxx5' or xxx6. Then I also have an ssid that they all share. I do this so I can force devices onto a specific band OR overcome the band issue for older devices - like a vacuum that has to be on 2.4.
I run with a setting in my TPLink for 'balanced band sharing' which I believe is supposed to keep the number of connected devices relatively even across bands. Personally, 2.4 works best, especially through walls and such - the 5 is good for distance but only if theres little obstruction. I don't really have much feel for 6 except it is MUCH faster.
I have a single SSID for three bands and the devices that only connect to 2.4 set up without issues.
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I have one SSID that uses all bands and one that just uses 2.4. I have a couple of older iot devices that don't like mixed SSID's.
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