Owners of Titanium PowerBook G4s have reported problems when moving their machines when powered-up or in sleep mode.
A flexing in the case disconnects the battery, shutting the computer down and interfering with settings. There are also claims that the machine shuts off when asleep.
Disappointed Titanium punters are also complaining of problems with the Titanium's DVD-ROM drive causing the machine to shut down, necessitating the resetting of Date and Time.
Apple recommends never moving a laptop when it is turned on.