Mentalist: It's weird that you get the SHUTDOWN warning but the device starts up... Don't know what could be happening there..

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I don't know this is normal and/or it could be cause of problems:

Every time I take the battery out from the device and then start it up, it asks me to enter date and time configuration. Doesn't the n900 has an internal battery to save this configuration?

The boot log shows some lines with warnings about clock (I will try to be more specific about those warnings and try to post them later).