Popping sounds in headphones after podcast or other background audio stops in standby

So, i recently started listening to podcasts when going to sleep or when i wake up at night. I finally have a 5X with a good display since a week and i recognized this problem because it always wakes me up. :P

I still couldn't figure out what causes this bug(?), maybe some of you could test it as well:

• I use Podcast Addict, but i tested a few other apps as well, the problem occurs there too.
• I listen to the podcast and, with screen off, when the podcast stops because it's finished or the sleep timer stops it, a regularly popping sound comes out of the headphones until i activate the screen.
• Sometimes it doesn't happen when i unplug and plug the headphones in again, i use some cheap 3-conductor sony in-ears.
• I found additional 3-conductor earbuds in a drawer, same problem.
• It seems that it doesn't occur with the 4-conductor iPhone earbuds/headset of my wife. That also seems to be the case with another 4-conductor In-ear headset i found.
• I'm on the march build MHC19J and can't tell if the problem only occurs in this build.

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