- I can't jog with the APP3: the new tips transmit too much of the impact vibration into my ear, creating a painful noise sensation that can not be healthy. Same for walking sometimes! It makes me walk carefully and weirdly.

- Certain type of noise, like strongly vibrating idioit cars and idiot motorbikes also create some very painful feedback noise that makes me take them out when I need them most.

- I too experienced this horrible screeching, but I wasn't doing anything specialy. Cupping them made it worse, taking the out and in again did not help. I put them back in the case and a few hours later this issue disappeared.

To me, the APP3 feel half broken and dangerous, I regret buying them, I wish I would have bought just another set of APP2.

It was one of the most anticipated Apple upgrades of all times and they dropped the ball.