Surround sound cuts sound

[Dell]

hi all
New to this forum
I hope someone can help me I have onkyo amp when it is on works fine until anything else is turned on then it cuts but not sound but not always for a few seconds, I have tried plugging in in a different socket and I have had the house electric checked out can anyone help?
Thanks in advance Dell

 

[leaudiophile]

I used an Onkyo, which had a similar problem, it cut out when I went from 5.1 to 7.1 channel. Then back to 7.1, I put the problem down to the connection, too much power was going into the 5.1 as it was set up for 7.1.When I went back to the 5.1.It may be the same problem with yours.