I bought a Digifusion FRT100 on Sunday. After it's been in use for about 1 hour the box, particularly the bottom ,gets very hot, almost too hot too touch. Even when in standby it still feels quite warm. Is this normal? It also gets very unresponsive to the remote or even the buttons on the front. Also no sound on any of the ITV channels and channel 4. So is it a faulty box or are these "features" of a cheap Freeview box?