This is a huge thread and interesting topic as the genre of TWS in ear buds develop. I've been on a quest myself recently and I'm looking forward to contributing my experiences on here.
However on this post, I'm posting to reach out/call out any other fellow Earfun Air Pro owners out there. I recently got a pair and though I may have some things to say about it's performance later on, I found that they are extremely frustrating as they always open up the music player and begin to play music each and every time they connect to a device, I have tried this on an iphone, android, and even a blackberry and it does the same for all devices.
With my Earfun Air Pro's, as soon as the Earfun Air Pro's are paired(even on the first initial connection/setup) it immediately and automatically opens up the music player app(default music app for ios, vlc-my default for android, and default music app for blackberry) and begins to play music. In addition, after I stop the music and even close the music player, if I remove one or both of the earbuds momentarily from my ear and stick them back in my ear, the music app will re-open and begin to play music again. I could be on my home screen, or web browsing and it still does this, very annoying, very frustrating.
I'm not sure if my Earfun Air Pro's are defective, or if they sent out a batch with this glitch(I saw that one other recent reviewer on Amazon mentions this), or if this is normal. I understand that the Earfun Air Pro's are supposed to pause/resume music when taken off and put back on while listening to music.. however my issue is that it will do this even if I wasn't listening to music... and in addition, as soon as the Earfun Air Pro pair to my device it opens up the music app and begins to play music and I have to stop it.
I've tried numerous things, like resetting the connection(forgetting the device, etc.), double tapped the reset button, long hold (3+ second) reset, I also tried disabling music app notifications, and of course I've closed the music app altogether, and none of these things worked, the Earfun Air Pro still exhibit the same behavior and proceed to open the music app and plays music once connected.
I hope what I described made sense, apologies for sounding redundant as I was trying to be concise. Essentially my Earfun Air Pro's always launches the music app and begins to plays music, every time, all the time from the first connection to each subsequent temporary removal of the earbud.