Thanks for the continued suggestions! I tried locking the screen but the entire device goes unresponsive save for holding the power button to turn it off.

One thing that I was surprised to have worked was if I start streaming an internet radio station the device works perfectly so long as the station is streaming. If the connection is lost though, the device goes unresponsive until switched off again. Does anyone know of a similar program that I could run to keep the screen responsive that doesn't require being online?

Thanks again!