It seems to occur when airflow flows over the crossbars. My other headphones (ones that cover your ear) would hurt after a couple hours, but not these ones. I have returned them to the seller (at my expense) and have requested a size 10 replacement. I love these earrings & have gotten so many compliments! As for Anker I?m showing 5 pieces I I am absolutely delighted with, my son couldn?t get his white 6 in to change anything Amazon gave me phone number to call as I?m well under a year to replace cord , I haven?t had any issues with my Sons Cable so I didn?t even tell Anker about it- Anker Genuinely care?s an expects customers to reach out With any an all issues With there products , They have done something beyond my expectation due to family emergency, I?m only going to say , I wasn?t allowed to Nice quality strong hooks! My husband wears a hard to find size 14XW. Came inWithout issues, very easy to assemble. Found out the Synapse Software doesnt support Mac Catalina. Aftershokz are difficult to listen to on my off-the-shelf laptop computer, but perform reasonably well on the AK 100II music player.