So I get static in the left side. It sounds like the static you get when you drag your finger over the needle of a record player. It happens when ANC is on and;
1 I wiggle my ears to adjust them
2 turn the left earcup into the off position
3 adjust the headband fit but only the left side.
4 sometimes just always on
It seems like when the pressure in that side changes it happens. I have opened it up and did not see anything obviously wrong, like bad soldering or worn wires. It makes me think that there is an issue with a mic in the earcup. I also think this because I have used it with only the left ear on but the right behind my ear so I can hear around me with and without the ANC on.
When I opened it up there was the main driver and then four paper covered things around it. They all looked good to me I can upload photos if it would help.