Hi, had my galaxy for a few months now but recently the LAG (im referring to delays moving through apps / screens etc) has become horrendous. Im a complete novice and read several posts on curing it. Every so often i go into settings and close down all my running apps. Ive looked at the one cure lag fix app thing. Do i need to purchase it as i downloaded the freebie but doesnt let me do anything. Sorry guys but i need as much guidance as possible!!