Mercedes-Benz 2007 S550 "heat blow" Questions

I purchased a Rand Mc Nally 7710 less than ayear ago. Now the car charger heats up to burning my hand and does not charge the device. Is this a common problem? Might be to late to answer this but here

...refurbished all have the same problems, they all blow fuses once in awhile and they all have over heating issues. take it back to the store you bought it from.. The refurbished also have this ...

...This product is made to use in a car yet I am being told not to leave it in direct sunlight or heat and to make sure my a/c is blowing on it. How can I do this and still use it as a GPS? Please ...

...blow. The second most likely problem is that the internal battery inside the c330 has died. This is especially likely if the unit is old (more than 1 year) and if you live in a climate with extreme ...