silly little glitch

[aikidoka]

I'm using a background image that's on the device. The image is in \My Documents\My Pictures\Backgrounds

I made it the background image via the image viewer, so I could set the transparency. Unfortunately, every now and then the screen flickers and it looks like the image viewer is coming up as I can see the top bar of the app briefly.

Any idea on how to fix that or is it just a typical windows mobile glich?