I can understand why you think that, but 'swapping' out a router with an identical model, more than likely forces a new IP address, which may have a different route to the main switch, which is more likely why the swap out worked. That said, I've seen routers in places they have no business being in (ie attics, wet basements, garages, etc) which, of course, will limit its lifespan. But, again, the more likely fault are adjustments/interference somewhere else. For about a year I was fighting Frontier to improve my internet. I went so far as to tell them the exact 'switch' which was causing the problem. But, 'deflection' (ie shifting blame) is a major strategy with internet companies. It was only when I got a VP of their local region that they listened. And voila, reliable consistent high speeds since.