With 4.0.3 my 5 GHz WiFi frequently dies. It worked on 4.02 to my best knowledge.
Turris Omnia 4.0.3
root@turris:~# uname -a
Linux turris 4.14.158 #0 SMP Fri Dec 20 00:24:37 2019 armv7l GNU/Linux
root@turris:/tmp/log# cat messages
Jan 7 18:44:20 turris kernel: [432952.178872] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:20 turris kernel: [432952.281264] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:20 turris kernel: [432952.383660] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.486060] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.588456] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.690851] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.793246] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.895637] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.998030] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
root@turris:/tmp/log# dmesg
Jan 7 18:44:20 turris kernel: [432952.178872] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:20 turris kernel: [432952.281264] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:20 turris kernel: [432952.383660] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.486060] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.588456] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.690851] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.793246] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.895637] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
Jan 7 18:44:21 turris kernel: [432952.998030] ath10k_pci 0000:02:00.0: SWBA overrun on vdev 0, skipped old beacon
It works again after a reboot.
Too bad.