Although it's a chore to reset all the routers back to their default settings, scan all computers with Malwarebytes or other antimalware program, then change the router settings and reconnect all the devices to the routers again, those steps should fix any malware that may have caused issues. Make sure all routers have their firewalls enabled to medium.
But it appears like there may have been a temporary power issue to the devices. Even if it was just a blink in the power to the routers or other computers, the older laptops (5-7 years old is really old) could easily break because of it. Same thing with the phones as when the network stopped, they could throw the errors.
Although what you say is possible, you haven't told us enough about who was on your computers/phones/play stations at the time of the problem. Are you sure the problems happened at EXACTLY the same time?
Hope this helps.
Hello. I have a home network with 3 routers and 1 switch.
On Sunday, two laptops connected to WiFi from one of the routers suddenly needed to be booted into recovery mode and one ended up needing to be factory reset.
A PlayStation 4 connected via WiFi to one of our other routers also needed to be put into recovery mode.
Two mobile phones on the same WiFi as the laptops received popup fraudulent site alerts on sites such as Yahoo Answers and Google.
One laptop was able to boot after going through recovery mode, the other needed to be factory reset. The PlayStation 4 is still unable to turn on properly. One other PlayStation 4 and another laptop on the same network both appear to have no issues.
I checked the routers to see if the DNS was changed or anything of the sort. Both laptops that experienced issues are around 5-7 years old, however being that all of these events occurred at the same time I'm more worried that it's an issue with our network possibly being infected rather than issues with the ages of the laptops?
Any advice or input would be greatly appreciated as I am concerned that other devices on our network will begin having issues and any potential viruses will spread.