Later, I had a more private talk with one of the support guys. He revealed to me there was an order from Sony to tell callers exactly that.
Gosh, the touchscreen keep going back to home when i'm in a middle of fb conversatuion.
I was testing with chromecast +youtube: those swibe action to enlarge or fade out afe 99% imprecise...
Really wondering if I can return the item to amazon to fix this problem...