Sounds like SD card corruption. If you manually copy kernel.img (KERNEL) and SYSTEM to the SD card using a PC, don't forget to extract the firmware from the target folder too.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.