Earlier this year my Netgear POE switch went bad and stopped routing traffic correctly. It took me 4 hours to figure out the problems was the switch. Luckily I could borrow one of my other switchers to see if the problem went away. That's when I found out how much better performing my newer broken switch was versus my older one. Luckily the Netgear switch has a lifetime warranty and I got a replacement within a couple of days.
Everything is working great, then a couple days later my Netgate SG-2220 goes dead. Netgate support couldn't help me recover the unit. Get a replacement board. Reimage. Found out the Intel Atom's were bricking.
To improve my home wi-fi I just added a 4th access point. I can now have one access point go bad and the remaining three will cover the house. It is a luxury to have 4 access points, but one will go bad at some point. i can log into the access point controller to trouble shoot wi-fi.
The failed firewall and switch has me thinking more about redundancy.
At some point I may go for a complete redundancy for the firewall and switches which besides reducing the single points of failure it means I can do maintenance and network will not go down.