Hi there,
Your touch screen is malfunctioning. Same thing happened to mine and after a while almost all the touch functions go out of business, and that happens because of the heat or sun rays (according to the manual). Send yours ASAP if it's still under warranty, it costs $200 flat fee for them to change the LCD screen (including labor and shipping).
You can send it to Columbus, OH or Long Beach, CA. The address to get it fixed in Ohio is:
Pioneer Electronics
Attn: Repair
2161 Dividend Drive
Columbus, OH 93228
Include your address, phone number, model, serial number and what'