I didn’t use my Sennheiser MM 500 for long time but resurrected them a few days ago to compare these to my headset provided by my employer. I realized a weird cracking in the left ear which reminded me why I didn’t use these pairs for a long time. I decided to figure out what exactly causes the sound issue. After taking away the ear foam there is a mesh which also have to be dismantled. I checked the speakers and realized two plastic parts. After a little bit search I identified the small high tone speaker on top of the main speaker. The seat wall where it is pressed in is broken – on both sides. The mic still sits great there. After gently pulling out the broken plastic parts the headset is working like on day one… Give it a try if you own a pair of these, it is worth it.
It seems like there was a new firmware and app version deployed.
I have to test if the issues are gone now completely but it seems that the artifacts issue in photos and videos is now gone and back at the quality level before the 1.6.3 version and without the other bugs. I will have some tests these days and report here.
UPDATE: ok the quality issues really seem like to be history BUT…
… right now you have to deal with constant WIFI disconnects. It´s like a nightmare what´s happening to this perfect hardware on software side. with every software update one issue is gone but a new is popping up.