mine has been doing that since yesterday...i have to actually slide the keyboard out to "wake it up" and once i had to plug it in to the charger to wake it up. BUT...this all started after i put on a plastic case i just bought...took it back off & wa-la! no more probs...think it blocks the sensor or something b/c without it on it works perfectly fine. guess i'll just have to deal with it if i want my phone to look "cute" 
