So after reading all the stories of people using the poster putty to clean up and restore the functionality of their APPs, I decided to buy a pair last week. I originally bought a pair the first day they came out, but after about a week the fit test the fit test started failing and the bass response disappeared. I think ANC got worse too, but I don't really remember. I returned those after testing some new tips in the Apple Store.
After a week of owning my new pair, the fit test is now failing and the bass response is gone. ANC seems reduced, but I'm in a quiet office so it's hard to specifically tell. The blu-tack trick isn't working for me. I really feel like at least part of my problem is that the ear tips have a certain stiffness to them that breaks down with use. They felt super secure in my ears on day 1, much less so on day 7. I'm returning this pair as well and have given up on this generation APP.
I'd be interested in trying again if Apple releases a v2 that acknowledges (even in a roundabout way) the issue, and/or if Comply or a company like that comes out with a really well regarded set of replacement tip. Super bummed as I love these when they work.
I've long suspected the ear tips are a wear and tear item. For my APP, both of my eartips lost its stiffness after 2 weeks of using them about 5 hours a day.
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Just try different tips. Everyone's ears are different. The foam ones have a tighter fit and work better IMO.
I also tried the small and large ear tips. These both failed the ear tip test. The medium passed the ear tip test until 2-3 months ago.