I've had my Droid 3 for a few weeks now.  I love it so far.  I've only encountered one issue that I have not been able to solve so far. That issue being:  For no apparent reason, sometimes when I pick up my phone, the wallpaper has changed. 

It is not a huge problem, but can be annoying.  I spent a lot of time getting my phone aesthetically to the point I wanted.  I do notice if happens mostly when the phone has been charging, but it has occurred at times where it was not charging. 

The theme does not change completely, only the picture for the wallpaper.  It always selects a random wallpaper saved to my gallery to use. 

Any ideas why this is happening and how to fix it would be appreciated.