This morning I saw this in the logbook:
kernel: CPU: 3 PID: 1472 Comm: asd Tainted: P O 4.1.52 #2
Sep 10 15:17:37 kernel: Hardware name: Broadcom-v8A (DT)
Sep 10 15:17:37 kernel: task: ffffffc02f6ab580 ti: ffffffc02cc64000 task.ti: ffffffc02cc64000
Sep 10 15:17:37 kernel: PC is at...
I updated my ax86U to the 388.1 firmware and everything went well.
The only problem is that my USB hdd won't go to hibernate mode anymore. It worked fine with the latest beta firmware.
@RMerlin, I know you don't change the usb drivers. I just wanted to report it.
Sorry I don't remember what the log said, but I also had the same problem as soon as I connected my Oneplus phone to my network. I still don't know why but as soon as my phone connected to my wifi network my ac66 router rebooted. I then solved the problem by buying a used AC68 router.