Hi
Whatever you do m8-do not put the 360 in the vertical position.
Always keep it horizontal and raised off the surface it's on using something in the middle of the console area ( the air intakes at each end of the unit are vital for cooling )
It doesn't like being put vertically unless you have the correct stand and extra fans and even then it has bad airflow.
I've had similar problems but since following this -horizontal only- rule, i've been ok.
Once you fry the internals of a 360, get a replacement for MS-it's the only cure.
Hope this helps and you have better time ahead-
Take it easy.
Grafraith.