PC hardware has been using lead free solder joints for quite some time. However the consoles having cheap quality material, designed to be functional with minimum quality and expenses aswell as cramped space for airflow wont end well in the long run. The "low" prices comes with serious penalties. Which reminds me of when I had an Xbox and the manual said max ambient temp 30c which is low. A warm summer day the machine will be redlining the max temp barrier. And really didn't the Xbox also suffer from quite a lot of failures back then?
I remember my first Xbox (black one) died completly after about total 20 hours of use during a week in a cool environment. However I got it replaced with an Xbox Crystal and it worked for the 8 months of time I had it although with very little usage.
Must have been your unit, because the on the whole the original Xbox had very little heat issues. It's biggest issue was the poor Thomson drives where the laser lens would fail to read disks because of collection of dust. Another big issue was the recalled power cord. I think the actual problem was with the actual power cord connection, but they replaced the cords with those that have a circuit breaker included. Other than that the Xbox was a pretty tough long lasting machine. I still have my original from 2002 & it's still running like a champ.
Tommy McClain