@LukeF Well, everything is relative. Routers tend to run "warm" inside, so thermal cycling could play an eventual role in it's failure. Whether that be 1 year or 10 years from now, is anyone's guess. The heating and cooling causes mechanical shifting, which slowly damages solder connections. Many factors influence this, such as which types of solder connections are present, the composition of the solder, the differential of temperature, coefficents of expansion, etc.