Client deauthenticated under load

AP: Netgear R7800, OpenWrt 21.02.1, r16325-88151b8303
Client: Intel AX210 on Linux

Under heavy load the AP deauthenticates the client due to inactivity, but that's clearly not the case here, the client is very busy moving data.

Sun Nov 21 12:52:39 2021 daemon.info hostapd: wlan0: STA 28:df:eb:... IEEE 802.11: deauthenticated due to inactivity (timer DEAUTH/REMOVE)

I think I've seen these types of issues before and I thought they were fixed. Are they back?

Or is it a client issue? This Intel AX210 is new to me, just started using it in a new laptop.

Maybe it is a client issue:

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