bm7000s picture no sound

can any one help me please i have a blade bm7000s hd works ok but some of the plus 1 chanels on documentrs picture is fine but no sound i have tryed a fresh scan and still the same can anyone help thanks
 
Hi, I have a same issue on different box, after much stressing I turned TV off and on and sound then plays, so everytime it happens I turn TV off and on and it works, I think its something to do with the HDMI handshake, just guessing.
 
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