Did something change in the configuration just prior to the onset of this problem?
The buzz - is it physically emanating from the unit or is it laid upon the audio through the speakers?
If the latter, look for signal cables running near power cables or devices with stong magnetic fields, look at track lighting use correlating with the problem.
I found transformer hum discussed here...
http://www.pechorin.com/m/2006/01/11/davsa30-252707.html
http://www.reviewcentre.com/reviews5213.html
http://www.amazon.co.uk/product-reviews/B00008XYJ7?pageNumber=2
Complained about the transformer failing.
I'd say that makes a trend. But I can't imagine why it would correlate to watching movies.
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