wlcore: ERROR Tx stuck (in FW) for 5000 ms. Starting recovery

Hi,

Having had lots of problems with Broadcom BCM4330 hardware apparently misbehaving (monitoring the wifi traffic shows lots of retransmissions eventually resulting in disassociations despite a signal level of around -40dBm) I decided to replace that machine with one which uses TI wl18xx WiFi - I have another also using TI wl18xx and that seems to be doing fine, although has less (and different) clients on.

I'm seeing the following from 5.6 kernels when running wl18xx in AP mode. I'm not sure what's going on, only that it seems the firmware is somehow dying. Does this look familiar to anyone?

wlcore: ERROR Tx stuck (in FW) for 5000 ms. Starting recovery [removed useless drivers/net/wireless/ti/wlcore/main.c:795 backtrace]
wlcore: Hardware recovery in progress. FW ver: Rev 8.9.0.0.79
wlcore: pc: 0x0, hint_sts: 0x00000020 count: 1
wlcore: down
ieee80211 phy0: Hardware restart was requested
wlcore: PHY firmware version: Rev 8.2.0.0.242
wlcore: firmware booted (Rev 8.9.0.0.79)

Does anyone have ideas how to avoid it?

Thanks.

RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line in suburbia: sync at 10.2Mbps down 587kbps up