Didn't make any difference for me sadly.

Seems there is no specific option for that other than simply splitting the bands in to separate SSIDs. I created a new one with MLO and will try that, if that doesn't work I will do 5ghz only and see...

@RF_Dude which setting is that? Much appriciated for the help.

@Vincent-TP No apparent power saving settings are turned on. Initially I would have said that it occurs after prolonged periods of rest, but at this point I would say it's random as sometimes it...

@Vincent-TP It has started happening again with that setting turned off too. So it's not due to "Unscheduled Automatic Power Save Delivery" setting...

@Vincent-TP I narrowed it down to the "Unscheduled Automatic Power Save Delivery" setting. Turning this off resolved the issue, but this feauture worked before the new firmware update.