Closed captions keep turning off

My wife is deaf so closed captioning is vital for us. Since we got a new box, the closed captioning will turn itself off when live tv/demand is paused for a few minutes or when we switch from live to demand and vice-versa. We've turned it on with the down arrow options and the settings options. Neither one keeps the CC on until we want it off. This hasn't happened before until approximately a week ago. Anyone else?