Hi all, sorry for posting out of the blue. I had my APP replaced six times due to noise cancelling problems. I did not have that rattle sound when I had my APP in use when walking. I do sweat a lot and I suspect that my sweat does affect the inner mesh port of the APP, when ever I look at the black inner mesh I does become shiny and a bit oily. I decided to stop coming to Apple Store as well as the staff always make the same excuses of "we updated the firmware of the airpods to make noise cancelling weaker for safety.", something like that.
Anyway, I would like to share what I do to make ANC stronger again. Instead of using a blu tack or something similar, I use a 3M VHB tape, the clear one.
I usually cut around 1 inch length and I gently stick the tape to the black inner mesh port of both airpods. I repeatedly do this until I see the mesh is clean and not oily anymore. This should make the ANC stronger again. Been doing this for the last 4 months already.
It is a pain to do this now and then... I'm actually on the edge of buying the Bose QC Earbuds but gotta wait next month incase Apple releases a new version of the APP hopefully with the added fixes. If not then I'll go with Bose, even though I hate the case and the size... really wanted a good ANC earbuds. BTW I tried the new Sony's but I did not find the ANC strong, also they are a bit uncomfortable... The Bose (when I demoed from the store) and the APP does seem to cancel out chatter noise as well compared to others.
BTW I live in Hong Kong so sometimes, exchanges are a bit difficult unless there is a very serious defect.