Ear Fun Air Pro 3 unable to pause using double tap

Just a couple possibilities. (I'm just throwing out ideas here lol). 

Control mapping not right: Maybe somehow the double tap for pause got changed or disabled. If that's the case, go to the app and set pause to double tap.

Tapping to slowly:  Tapping to slowly can cause it to adjust volume. However, tapping to fast has never been a problem for me. I can tap super fast and it pauses. If it is a speed problem I would say it's on the slow side.

If all else fails I would suggest resetting them. If that doesn't work perhaps a firmware update could fix it. 

I hope you get them working soon. Best of luck.