Fox/Freeview Fault? Switching from BBC 1 to BBC1 HD and sound cut off


I don't know if this is the Fox or Freeview/BBC messing around with the channels but last night around midnight I just happened to notice the sound went off whilst on BBC1 and then it came back then went off and then Live at the Apollo started. Shortly afterwards it switched to Rugby which was what should have been broadcasting on BBC1.

I'm hoping this is some kind of transmission glitch from the BBC or a Freeview glitch and not my luverly Fox going down the tubes????

Did anyone else notice this happening?