I actually bought an AirPods wireless for my daughter 1st on Tue. Got poisoned by the Incase woolenex casing that she like. I tested her AP2 and really reminisced the ease of fitting in the ear.
APP was really good. All was well until I realised it has a tendency to come loose if we talk or chew food while eating. Basically jaw movement will make it loose. Worse is it can drop out of my ear without me having a chance to catch it before it landed on the MRT cabin floor. It’s my ear problem. Not the size of the S/M earbuds. I can only fit AP2/Klipsch oval shaped earbuds/ciem.
That’s why that very Tue night I sold off my APP and ordered AP2 wireless.
Funnily enough I am the exact opposite of you. When using my Gen 1 AirPods, the left AirPod will always drop after prolong usage due to “ear sweat” but my right one stays on. Dropped a few times when I was dozing off on public transport and woke up realising the AirPod has dropped on my lap or floor.
After using APP, with size M on my left ear and size S on my right ear the problem hasn’t happened since perhaps due to the fact that it is in ear.