Hey,
when I turn on my UBOOM L the sound for successful connection plays really fast, less than a second. But the actual connection takes another 5 seconds, e.g. my phone keeps playing music even though I'm already connected to the box.
If I check the EarFun app the connection doesn't appear there when the successful connection sound plays, it takes the same 5 seconds.
I'm using a galaxy S20 and firmware version 1.2.7.