I have had positive experiences with routers from the ASUS folks. Reasonably priced, reasonably powerful. Not exactly the same build quality as Cisco but still reasonable. The menu/configuration/interface is a zero sum of pluses and minuses.

I only had two of these so it was no big deal to simply replace them with inexpensive ASUS units. I took the two units back to the shop for troubleshooting.One theory was that this was an attack coming from the WAN side. With that in mind, I fired up...

Like you, I fired up the router without anything connected to the WAN or LAN ports and it still reboots every minute and a half. I originally thought it might be some attack from the WAN side but now I'm thinking there's been a malicious firmware upg...