For about 3 years ago the sound did the same thing (disappear for 1 second ever 5 to 20 minutes - a bit random). I just lived with it and did not report the problem and it was like that for about 3/4 year and then that problem went away and has perfect for 2 years, until a week ago. Again the sound goes away for 1 to 2 seconds so and so often.
Can that be fixed?
I suspect it is not an internal (in my house) problem.
It defiantly is not something you robot answering service can fix.
Which there was a way to Email your service department.