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More likely a software glitch (sometimes just a blank screen, sometimes a blank screen with a white "BMW" logo in the center - probably due to a computer reset). Usually resolved with just a sleep cycle or a hard/diagnostic reboot. Not unique to the iX, this has been an "issue/finding/occurrence" with BMW models since at least iDrive 6. More rarely a problem with a faulty TCU (Telematics Control Unit). I wouldn't worry about it unless it reappears.
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