Like many other Sony TV customers I have just discovered that the Terrestrial 'catch up' apps have stopped working 😕.
I tap on them from the Google TV home page and they do not respond.
Other apps eg. Prime, YouTube all respond and load perfectly.
I have been away for a week and returned to find that I can no  longer use the catch up apps for terrestrial TV 🤔. 
I select the apps and they are totally unresponsive.
I am 'blonde' but, I discovered that I can access these particular apps through the "Live TV & Catch Up" app but I dont believe my TV should work this way. This is not what I thought I was 'buying' into when I purchased this TV 

So far, I haven't been able to find any official response or advise from Sony on this matter. Even a; "we are working on an update" type of  response would be helpful  😑