Hi,
my W910i always "crash" and reboot itself.
First,my screen get frozen and the softkeys disappear.
Then it vibrates and my screen become black but you can see light like you see at the startup.
And after that my background appears with the backgroundimage of the current theme.When I open the menu and close it again then my chosen picture is back as backgroundimage.
Last times he also set back the Walkman theme.
A friend also have this problem with he's W910i and he don't mod his phone.
I flashed my w910i a fewtimes with SEUS and A2uploader but it has no effect.
