I have been running Firmware Version:
3.0.0.4.386_41712 for months. It's rock solid stable and very fast. Might be an idea to try that first. Having been burnt in the past, I always stay one firmware release behind.
Jul 13 21:07:29 kernel: wl0: PSM microcode watchdog fired at 776668 (seconds). Resetting.
This is related to WL0. At a guess, you have a client on your network that's misbehaving and causing the radio to shut down. Try updating all the drivers on your devices, especially on intel laptops. If that doesn't work you'll have to try and find the culprit through the process of elimination. It might be worth sending this to Asus support, they may work on a patch to protect our AX92u's in the future.
Jul 13 21:25:22 kernel: wl0: random key value:
This is just chatter, ignore it
70:EE:50:1C:86:50, status: 0, reason: Disassociated because sending station is leaving (or has left) BSS (8), rssi:0
This is normal, it's just devices roaming between nodes.
The rest of it is either normal or related to the watchdog firing.