Sorry to see that you've been struggling to watch Box Sets on your TV Go application.
Can you tell me what error you're encountering when you're trying to watch the box sets on the TV Go application? Have you done any basic diagnostics, such as uninstalling and re-installing the application? Have you had this issue on multiple different devices or has this only been effecting the one device?
It may also be worthwhile to see if this is an outage that's effecting customers in your local area - Check the service status checker to see if we've recently reported any outages that may be causing this fault