I don't know how or what has happened, but when my glo was auto-updated to 3.2.0, I had to double tap almost always to turn a book page. I haven't done anything but this problem has somehow disappeared (as much as I remember, the issue has been gone for at least a week (I'm reading a book everyday for about 5-8 hours)). I'm still on the same fw version and I have not re-loaded 3.2.0 fw. That's weird, but good
I hope the slow tap response in the game Word Scramble will soon fix itself too