tiger,
white screen issues sounds like multitasking problems so i have moved your comments here. the OS is pretty aggressive in app management. I would advise you to smoke over this thread and read up on others' experiences.
to help, if you have live wallpapers, lots of apps on homescreens, lots of running apps, try and remove some of those. also go to the storage section in the settings menus and free up some ram memory...
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