One of the leading factors that can create or provoke issue on your SL2 is to REMOVE the battery out of the device without performing a Full Shutdown. This includes when you want to install a new MicroSD card. Hold down the Power button for 5 seconds to ensure it does not enter Sleep Mode. Pulling the battery is bad for the device and is equivalent to shutting down your PC down every day by pulling it's power cord. It just results in problems down the road. After the device has been completely Shut Down and Rebooted it performs a file "cleanup". Pulling the battery, even while in Sleep Mode, can create Library problems and other issues discussed in the forums.