Hello,
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)
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).
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...