techsupport

So, i bought an airpods 3 almost two years ago. I was pretty happy with them right up until the warranty was about to expire, when half of the earbuds stopped reliably charging in the case. I brought it into the apple shop, and eventually they exchanged the whole thing, case and airpods. Now, after around half a year later, the issue happened to me twice in a few days. Am i just unlucky, or does the airpods have some fairly significant design fault?