Live programming not able to navigate backwards

I just got a new DVR box after my 15 year old one was showing signs of failure and the new one does not seem to have the capability of backing up live programming when you choose to watch a recording and then come back to the live programming.  The old one used to do that.  Is that a fault with the new box or is that just a poor design?  The new box is an XG2v2-P, Model: PX022ANM.