Hello i have a sony bravia 75" tv which has developed a problem it is about 2 years old model number KDL-75W855C . I came downstairs this morning and the tv was continuously turning itself on and off and still is 4 hours later. i understand there is an update due for release but all that is happening is the sony logo comes up on screen for about 10 seconds and then it turns itself off again . Due you have any idea what is going on?????