Keep you cache cleared, keep yor disc clean, and run a blu-ray cleaner through your ps3 once a week. Preferably the brushless one (has 2 holes in it and creates a wind tunnel effect, cleaning the lens) made by memorex. You might need to take your ps3 apart and clean the lens with alcohol if it has never been cleaned. Also, if you smoke, this will create a film on the lens inside. There are two lens inside your ps3 btw, the smaller one is the blu-ray. Hope this helps everyone. 99% of all problems are caused by dirt, dust, debris.