Screen on Treo 755 fades after runnin video for...

Question

Most of the time when watching the Sprint TV or watching a movie on my 755 the screen fades to where the images can hardly be seen. This usually happens after it has bee running say 10 minutes. It has happened sooner and sometimes later...no consistencies. I use to think it was because I had my charger plugged in at the same time but that didn't make any difference. I don't know if maybe the battery gets too hot and causes this or if that even has anything to do with it. I've not heard about anyone else having this same issue. Normally, I turn off the application and let my phone rest for a few minutes and then it works but always ends up fading again.