AP stops with mt76x2u: error: mt76x02u_mcu_wait_resp failed with -110

My AP usually stops when I update all the packages on my Android phone that were installed via google play.
I tried to reproduce it with iperf (client on my phone and server on my desktop).
It happened once but works alot.
I haven't found a way to reproduce it on demand.
I use a Raspberry Pi4 with an imagebuilder 2020-05-14 build of openwrt
and an Alfa AWUS036ACM (Mediatek MT7612U).
I have it set as a 5GHz access point.

I found this bug report that might be related:
mt76x2u mac specific condition occurred #403

# dmesg
[1461031.326341] mt76x2u 2-1:1.0: error: mt76x02u_mcu_wait_resp failed with -110

After remove and insert USB device:

# dmesg
[1461528.333182] usb 2-1: USB disconnect, device number 14
[1461528.555583] mt76x2u 2-1:1.0: mac specific condition occurred
[1461528.665062] mt76x2u 2-1:1.0: mac specific condition occurred
[1461528.765063] mt76x2u 2-1:1.0: timed out waiting for pending tx
[1461528.771773] br-lan: port 2(wlan12) entered disabled state
[1461528.782735] device wlan12 left promiscuous mode
[1461528.787501] br-lan: port 2(wlan12) entered disabled state
[1461530.265357] usb 2-1: new SuperSpeed Gen 1 USB device number 15 using xhci_hcd
[1461530.290773] usb 2-1: New USB device found, idVendor=0e8d, idProduct=7612, bcdDevice= 1.00
[1461530.299179] usb 2-1: New USB device strings: Mfr=2, Product=3, SerialNumber=4
[1461530.306529] usb 2-1: Product: Wireless 
[1461530.310568] usb 2-1: Manufacturer: MediaTek Inc.
[1461530.315387] usb 2-1: SerialNumber: 000000000
[1461530.453673] usb 2-1: reset SuperSpeed Gen 1 USB device number 15 using xhci_hcd
[1461530.483230] mt76x2u 2-1:1.0: ASIC revision: 76120044
[1461530.521613] mt76x2u 2-1:1.0: ROM patch build: 20141115060606a
[1461530.696481] mt76x2u 2-1:1.0: Firmware Version: 0.0.00
[1461530.701755] mt76x2u 2-1:1.0: Build: 1
[1461530.705606] mt76x2u 2-1:1.0: Build Time: 201507311614____
[1461531.521298] ieee80211 phy13: Selected rate control algorithm 'minstrel_ht'

I reset USB device from Luci and it works.

Any ideas on how to reproduce it?

Start with the mt76x2u_mcu_wait_resp failure and the mt76x2u log messages in the report, then try the described iperf traffic between the Android phone and desktop. Compare the behavior with related issue #403 and determine whether the AP failure can be reproduced reliably; done requires an identified cause and a validated fix or reproduction procedure.