I had exactly the same issue described here:
FW version: RUT9_R_00.07.06.17
Previous FW version: RUT9_R_00.07.06.18
I tried to downgrade but nothing changes.
I have a RUT955 in my house with ZeroTier VPN services active.
The Wi-Fi is not stable at all. It suddenly and randomly disappears and I have to wait minutes (3-4)to have it automatically back.
I checked the log and there are no evidencies, it doesn’t seems a device reboot (nothing in the logs).
The Wi-Fi channel is auto.
The issue is the same descrived in the link above.
Of course all the connected smart devices in the house keep disconnecting, including alarm and domotics. So the risk is to have many services unavailable when needed.
How can be solved?
Thank you,
BP