If the problem is exacerbated by heat then it's mostly likely that the BGA graphics chip is losing integrity. This can only be solved by a replacement motherboard, and should be covered under the warranty as long as you do not open the xbox's case.
Try using it on a different screen just to make sure it's the xbox At Fault.
GPU chip, the Graphics Processing Unit chip. Replace it, get a new xbox, or settle with it.
I don't have a precise answer to your problem but the same thing keeps happening to mine. I think it is a bad connection from the computer to the screen (it happens when i bend the screen back) Everytime it happens to me, I either shake the laptop, hit the screen until it stops, or bend the screen back and forth.
No,i don't think it might be the bulb its depends on how long you used it or your right, it might be the bulb.
By definition a line keeps going forever.
The duration of Love Keeps Going is 1.5 hours.
my alarm keeps going of and wont start.
it keeps going and going and going and going no thats^ energizer's
Love Keeps Going ended on 2011-08-28.
Love Keeps Going was created on 2011-06-05.
nothing
not somewhere but he keeps them going by encouraging them.
.
No it keeps going