PS5, Phones, TV, Computers not staying connected to network

[trevor]

WiFi Network shows up fine and works with Speed Test.  Everything will connect but then shows failed or errors.  I got a DNS server error on my PS5.  Phones and everything else don’t show an error but won’t access internet, download, nothing.  I messed with the IP address a while ago using directions from another thread and it didn’t work.  I’m not computer savvy enough to do the software recovery.  Need help.