Product review (1 stars): Bad quality!
After less than a year normal usage, it began to automatically turn itself on during midnight.  I found out via google that it's a common problem for this model. So we had to turn the power off completely after use. Just a few weeks ago the situation got worse, and it would stop running and no response to touch.  Called the customer service and left VM, no one called back yet.  Called again and this time to tech support, apparently they knew the issue and immediately told me to buy ~$90 part to replace the control board and touch panel.