I have the same problem with my "3rd" iPod. I am currently using a JBL speaker docking unit. So am just guessing it's your iPod. This my 3rd one because of the locking up problem. And it still happens occasionally. That being said, the reason I'm looking at Klipsch now is because the JBL system seems weak to me. I'm looking for a good system with ballz. I like bass in a system. Hopefully the Klipsch can deliver that with two 2" woofers. Anyone know?