When I switch off the TV and digibox at the end of the day/night it will not switch back on immediately the next morning, it takes 3/4 attempts, and even when it does switch on it switches off by itself sometimes. It will switch back on straight away ok. I switch off and on with the remote control by pressing Sky button first and then TV button and then the off/on button. This problem suddenly occurred without me adding/changing anything. Any help will be greatly appreciated.