I have the same problem when using the Guide. Got the following tip from another forum which solved the problem: Switch off TV and unplug from the mains. Press and hold the Power button on the TV for a good 10 seconds. Wait a further 30 seconds and then plug TV back in and turn on. No personal setting lost unlike a reset and all apps also appear to be opening quicker. I think it is likely that one may need to do this after manufacturer software updates which clog up the memory.