Air Pro 4 In-Ear Detection (Sometimes) Doesn't Work

The same thing is happening to my Air Pro 4s. Everythign seems to be working fine but after extended use the in-ear detection on my left earpiece stops working. Putting them back in case for a bit seems to reset it enough to make it work again but the same thing keeps happening. I've done the factory reset but that did not help.

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Having the similar issue to my left ear bud, can you guys check if the issue isn't with the in ear detection not working but the delay of it. Since in my case, it takes like 5-10 seconds for the music and ANC to be turned off whenever I have the issue, but it works fine when putting it on. 

I have the similiar issue to my right ear bud, i have tried all the solutions, manual reset the TWS, factory reset, but eventually the in ear detection feature sometimes still doesn't work. The only way to fix this is to put both earbuds in the case, close the case then reconnect and then both earbuds. We have the same problem, what is going on? I just bought this TWS Air Pro 4 like a week ago, can you guys find the solution for us? It's kinda annoying for me. (Sorry for my bad English)