If its dead within one year it's still within warranty. So... Why aren't you returning it to be fixed. And any electronic device can go bad, just because you have one that is dead does not mean they're all bad.
I find a bigger issue with the fact that every TomTom we have sold the last 1-2 years has been returned because they suddenly stop receiving satellite signals untill we download an update. Which is absolutely ridiculous. There is no good reason a gps should suddenly not find satellites because you haven't updated the firmware in the last few months. Especially when it happens when you are on a vacation and are about to head back.
I wouldn't bother them to send me a replacement because I don't want a replacement device goes dead on me again... so I get something else instead of Mio.. My brother had Mio as well but it went dead on him too... He got a Garmin instead.