So I've had my 1520 for two months now and just now picked up my old titan II to redownload the song library on my 1520 manually, as soon as I started scrolling I had to wipe my fingers and the screen since I thought my hand was sweaty, after the wipe down I was surprized by how much easier it was to swype on the screen of the titan vs the the more grippy 1520 screen. Any idea why this is?