device cannot connect to 2.4GHz wifif when there are no other devices connected
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Hello,
I have a Xiaomi Light bulb that works on 2.4GHz network (model = yeelink-light-color5).
Previously I was using a defaul ISP's router which was lacking in features and power, thus I have decided to buy my own. But eveythring worked correctly.
As soon as I have replaced the old one with TPlink AX1500, the problems with bulb started. I am operating it via xiaomi's cloud. Recentyl I even connected it locally to HomeAssistant to check if that will help.
The bulb cannot connect to 2.4GHz when there are no other devices connected (to 2.4GHz wifi). It is not visible in xiaomi's app and locally over LAN.
As soon as I connect my phone to 2.4GHz wifi instead of 5GHz, the bulb is discovered and it works perfectly with both cloud and LAN.
I can then disconnect my phone, after what bulb either stops working or works for some time, losing signal sometimes and finally becoming offline. (sometimes it is offline in both xiaomi app and local HomeAssistant, but router still sees it and can be pinged). After I turn the bulb with physicl switch (cut the power and put it back on) the bulb is gone from the network. Of course, until I connect some other device to 2,4GHz. Then it will work again.
I have small apartment, bulb is like 2m not obstructed from router. I understand that those wifi liht bulbs have cheap wifi modules, but it worked fine on crappy ISP's router (UPC Poland ConnectBox). What is more, when I host a network on my phone (galaxy A50) with the same ssid (and wifi turned off in archer router) bulb connects instantly and works fine.
There is something wrong with my router handling the bulb. It is not the cheapest router, I was expanding to have something that will just work.
How can I debug this problem? Should I RMA the router?
The problem seems clearly to be with connecting to that specific router.
// I will also add that parental control is off, there are no strong wifi signals nearby. I was experimenting with setting the 2.4GHz channel in stone, also set it to 20MHz mode wide only. It did not help. Bulb has static IP assigned in dhcp, didnt help either.
