Wifi TX errors

Hi

I have noticed many tx errors on my HAP AC2 wifi interfaces. Is it normal ? I also noticed that this TX errors are increasing just when there is no traffic on interface.

Tx/Rx rate = 0 but Tx/Rx errors are continuously increasing ? Why ?

Edit : it looks that problem is somehow caused by CapsMan. When AP is in local management mode, no tx errors appears. As Capsman I use hap ax2 and caps are ac2.
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