I have exactly the same problems on my device -
1) "progressive whitening" of the screen during boot to OF that lasts for 2-3 sec. (with the latest bootloader it's not seen because the screen is totally white during booting - maybe developers colored it with white color on purpose so the problem won't be seen ?)
2) lockups ("white screen of death") happening here and there, at unpredictable intervals (from half a minute after reboot and up to one hour and more), especially during active usage of plugins.
3) "screen splits" - for a moment it looks like the screen's picture got scrolled half a screen, then the picture restores to a normal state.
In addition to it I have a "hardware version 1.1-specific" problem described in the following thread:
http://forums.rockbox.org/index.php?topic=9282.0so I guess all the problems above may have the same explanation - incorrect hardware initialization.
If anybody has any idea or tool that will help to diagnose the problems above, I am ready to help by testing the ideas on my device.