The Sony STR-DN1020 has started acting up on me last night. It has randomly started making a LOUD popping noise for random speakers on occasion, Then would get a loud tone noise sometimes. Tried resetting the unit to factory default and this did not help. Checked and cleaned all of the connections, no help. Also now when you change sound modes you loose all sound and must shut the unit off and then on to get any sound back. Now occasionally it was randomly shutting itself off. I'm thinking it may be on its way out, but am hoping I can do something to salvage this unit.