Fritzbox 4040 (ath10k/QCA4019) with 18.06.2 - Invalid VHT mcs 15 peer stats

my Fritzbox 4040 with 18.06.2 is suffering of "Invalid VHT mcs 15 peer stats" and disconnects wifi after a few days of use. Same problem as described here: [SOLVED] NBG6617 wireless disconnections

My question is: today, should I upgrade firmware as explained here: FritzBox 4040 - How to change ath10k firmware?
or should I upgrade to 18.06.4 ? (what is the version of the QCA4019 firmware in 18.06.4)

Best regards,

after digging on github, I see this:

define Package/ath10k-firmware-qca4019/install
$(INSTALL_DIR) $(1)/lib/firmware/ath10k/QCA4019/hw1.0

And I've found this message:

So I think my best bet is to upgrade to 18.06.4 and cross my fingers... If someone can confirm...

Hmm, I have those same messages on 18.06.4 but it seems to be working ok:

Station xx:xx:xx:xx:xx:xx (on wlan1)
        inactive time:  9240 ms
        rx bytes:       426457528
        rx packets:     3733291
        tx bytes:       6640551812
        tx packets:     4598013
        tx retries:     0
        tx failed:      1818
        rx drop misc:   4
        signal:         -54 [-59, -56, -95, -95] dBm
        signal avg:     -58 [-62, -59, -95, -95] dBm
        tx bitrate:     433.3 MBit/s VHT-MCS 9 80MHz short GI VHT-NSS 1
        rx bitrate:     24.0 MBit/s
        rx duration:    336823316 us
        authorized:     yes
        authenticated:  yes
        associated:     yes
        preamble:       long
        WMM/WME:        yes
        MFP:            no
        TDLS peer:      no
        DTIM period:    2
        beacon interval:100
        short slot time:yes
        connected time: 238577 seconds

checked with "iw dev wlan1 station get xx:xx:xx:xx:xx:xx"

EDIT: I don't have as many clients as in the message you linked, though.

The first time the problem occurs after twenty days. The second time after one week. During a few minutes the wifi is slowly becoming more and more unresponsive. I have to reboot the fritzbox. I have four or five very active stations on the 5ghz band (a tv, a chromecast, two pixels) and about ten on the 2.4ghz (but less active).

What I'm reading here is not encouraging: IPQ40xx and ath10k_ahb a000000.wifi: Invalid VHT mcs 15 peer stats

I've upgraded to 18.06.4
I will see in a few days if there are error message in the logs... Fingers crossed !

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Update: two days later, a lot of "Invalid VHT mcs 15 peer stats" on the log, and the wifi went down, and up. (during looking at a youtube video on TV) No need to reboot, just the wifi went down and one minute later it was working.
So, I've disabled wifi ac on the 5ghz link (put wifi N only) and after six other days, it seems to be stable.
No more "Invalid VHT mcs 15 peer stats" message, only "Invalid peer id XX peer stats buffer" from time to time.
I think I will stay with wifi N... :frowning:

There is no wifi down problem on 19.07 release.