He swtiches off all the time. He's a DM. Him and Joe Rodon as a CB pairing would be absolutely hilarious.
He should screen a back 4, pick it up and give it to the full back or the playmaker next to him.
All the time? I saw him comfortably control the Champions League final strikers Martinez, Dzeko & Lukaku back in March while playing at CCB. He's still young and consistency will come with experience.