How is the box connected to the hub because all the apps rely on your internet connection.
Have you tried a factory reset.
It's only a partial system reset and not a complete factory reset.
You are given 2 options,
Keep Recordings,
Format Disk
Choosing Keep Recordings, means you won't lose your recordings and any planned recordings or series links you've set up, but you will have to sign into your apps such as iPlayer, Prime, Netflix and ITVX again, also Match frame rate and Standby power consumption will go back to their default settings if you have changed them.
If the factory reset doesn't work then you might have a faulty box.