I am having the same issue with my box. We had it installed in August and had the problem then but, as we have not needed to use it until now so we never reported it. Please can a test be run on our box?
Thanks for letting us know about this on the community.
I would like to look into this for you but I'm unable to locate your account so I'm just going to pop you a private message which you will find if you click on the purple envelope at the top right of the screen.