I am pretty sure you are describing a similar failure I am having with a nearly new s6. It is obvious this is not a room treatment issue. Unless you are a little shy on brain resources, theres no way you would mistake this as anything other than hardware faults. Ignore the room treatment advice, as we should all know by now that room treatment isnt as big a factor as claimed, when using things at lower volumes. Room treatment is nice, but to compare your issue, it would be like suggesting someone to wash your car because it's not runnning smoothly.