I have the Arris TG6452, & it was strange that I also had issues after Nov 1st 2023, but I was getting "operation failed" when setting up devices I wanted to block from wifi during specific hours at night. Then, later when I wanted to delete them, I got error message.  So, only thing I could do was to change the time to a couple minutes.  So, I'm guessing it was the firmware update that screwed things up. My ISP (CasCable) in WV had no clue, and I got no help.  I hate to think I must do a factory reset!  I rebooted it several times and also unplugged trying that with no luck. I set up parental controls to block websites, and search terms. So, now I'm afraid if I block a site that later I want to remove, it might not allow, & go to error. Or, even a device. I'm a novice at it. When I access the reports, I'm not sure how accurate they are.  Plus, timestamps don't seem accurate. Trying to block porn sites, I think it helps some. PS. It's not a child's phone, it's an adult using my wifi here.

Any suggestions?