The triggering of the wakeup uses the "capacitance" effect which will be effected by the impedance of the users body at the time of touching the Beo5. If someone has damp hands for example when touching the Beo5, then the effect is likely to be greater and therefore more likely to trigger first time or with a lighter touch needed.
Because the triggering is effected the users body impedance and everyone is different, it is unlikely to be a problem with the Beo5 unless it never triggers.