I believe there's something in the system settings about deleting the cache. Unplugging the console for a few minutes also sometimes helps. As for hardware failure that doesn't require blunt-force trauma. Every time you use something it gets worn down little by little. If you do a lot of gaming, if the system isn't in a well-ventilated area (like if it's stuffed into a cabinet or tight shelves), if the room it's in is generally hot, or dusty, or humid, etc., these are all factors that can play into wearing it out faster. And just simple "old age;" if it's a console you've been playing on for years and years. Processors wear out, the tiny motors don't spin as fast as they use to, and that creates laggy response time in everything it does. There are a lot of tiny, delicate parts to consoles, computers, and other electronics that can wear out over time and render an otherwise "functional" device completely useless.