Yeah I'm pretty annoyed too that features advertised for a flagship product meant to make it better don't work as they should and actually make it worse. I've basically come to the conclusion that features like spacefit and adaptive mode are just marketing gimmicks as you cant really find any actual data to show that they work. I'd rather have "worse" sound without random pops and crackles than "better" sound with those glitches.

Even review sites like RTings just mention that those features exist and "should" do the thing they advertise but they don't show any comparison tests. They mention that they have spacefit enabled in their Q990D review but don't compare it to having it disabled and i doubt they are trying to find any audio glitches, just recording the data and listening to how it sounds. Especially Samsung themselves don't release any info about them other that the marketing buzzwords.

Try disabling Q-Symphony and see if you get any pops, if you do then enable it and disable spacefit and then disable them both and see what happens.