Hello, I myself have been experiencing this issue on my network. This are the things that worked for us, we first checked the signal strength of the channels affected. We determined that there was a range of 3dB - 6dB very low. We changed the channels and within minutes the signal on the clients increased significantly to a 20dB. I would suggest checking your signal and channels. I realized that in this AP auto channel selection is not working. It seems like I have to be switching channels constantly myself. Today I found out that the AP was located next to two glass windows. I suspect this is the root cause I hope it helps.
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