RAX70 Access Control List Randomly Blocks Approved MAC's

[RAX70]

The RAX70 wireless router's Access Control application is failing, it is randomly blocking previously APPROVED MAC addresses that most of the time work, but often they do not; I have to get into the app on an enabled PC and re-Allow them and save again. In the Access Control, I have Block All New Devices checked; I am guessing that THAT LIST of APPROVED devices is somehow forgotten, lost, or gets erased somehow.

Today, 4 out of 5 Access Points are blocked. Software version is latest as of 10/3/23, the 1.0.14.134. To this make matter worse, I tried to backup the settings and reinstall the update, but the backup files WOULD NOT WRITE to any folders, I get a temporary "being-downloaded transition file" named Unconfirmed xxxxxx.crdownload file where x is a bunch random numbers. 

So, Approved MAC's are randomly blocked and settings cannot be backed up. Can some one in the forum here or the Support Team help out? TP-Link never had this issue. C'mon Netgear, be better than this!

Thanks

[FURRYe38]

Has a factory reset and setup from scratch been performed since last FW update? A complete pull of the power adapters for a period of time after the factory reset then walk thru the setup wizard and setup from scratch with a wired PC and web browser. https://kb.netgear.com/22697/How-do-I-install-my-NETGEAR-router-using-the-router-web-interface
Recommend setting the default DHCP IP address pool range to the following after applying and a factory reset: 192.168.#.100 to 192.168.#.200.
https://kb.netgear.com/24089/How-do-I-specify-the-pool-of-IP-addresses-assigned-by-my-Nighthawk-rout...

Do not load a saved backup config from file.

I'd setup some ip address reservations for your devices as well:

https://kb.netgear.com/25722/How-do-I-reserve-an-IP-address-on-my-NETGEAR-router

Then re-setup Access Controls and observe.