RBE971 AP: Wi-Fi drops, wired stable, QCN9224 SSR & 6GHz fatal errors

I am having quite similar issues, that I believe also began with the update to the V9.13.2.1_1.3.35 firmware (although I cannot be 100% certain of this).  

Network Topology

• Model Orbi RBE971 operating in Router mode behind a cable modem using the V9.13.2.1_1.3.35 firmware 
• 3 RBE970 Satellites not hardwired using same firmware version.   
• RBE971 provides internal DHCP/routing

Symptoms

• My symptoms are also Wi‑Fi only.
  
  
• On average about once every day, (or 2-3 days at the most) all 3 satellites disconnect from the router at once, all Wi-Fi clients disconnect at the same time, and there doesn't appear to be any Wi-Fi being broadcast from the router.    This occurs at random times of the day (at first I thought it might be a scheduled thing or something one of the clients was doing to trigger it on a regular basis, but the times are definitely random).   

• When the event occurs I usually will gracefully reboot the router via the web management interface and then the satellites will reconnect (occasionally one of them has to be rebooted as well but usually they will reconnect organically after the router reboot).    I have not waited long enough to observe the Wi-Fi radios restarting on theirown/Satellites reconnecting without a router reboot.    The longest I have tolerated waiting to see if that occurs is 10-15 minutes, but so far it has not in my case.    
   
• Ethernet continues working, wired devices remain connected throughout (outside of when the RBE971 is rebooted of course), and also the RBE971 remains reachable via wired (web) management during events (as well as via anywhere access through the app via cellular coming in from external), again apart from the duration of the manual reboot.   

What the logs show

• The web management interface logs do not show anything leading up to and immediately prior to the event other than normal DHCP lease renewal events.   I have not attempted to gather anything via shell access outside of the the web management gui.   

Questions:   I too am extremely interested in the same things travisivart asked:

• Is this a known issue with V9.13.2.1_1.3.35? 
• Are there recommended mitigations while waiting for a fix (disable 6 GHz, disable MLO/Wi‑Fi 7 features, reduce channel width, etc.)?
• Is there a newer firmware (or a known-stable prior version that I can downgrade to) that addresses QCN9224 SSR / WLFW disconnect issues?

Needless to say this is extremely frustrating, and my family is quite irritated with the entire thing and are ready to throw the Orbis in the trash and get something more reliable from somewhere else.   I am not yet at that point since this was a costly upgrade from the RBK50 and I don't want to eat the cost of switching yet again, but I did keep the old hardware *just in case I needed something to fall back to and that is looking more and more like an option, at least until there's some confirmation that new firmware fixes this (or I can downgrade to more stable firmware).