I have been testing my first ever Samsung J3 2016 rom all day after installing this one yesterday.
I can confirm that my blutooth is also not working correctly (j320fn)
The blutooth can see my heart rate chest strap but my fitness program (Endomondo) will connect to it then instantly drop the connection, sometimes it will stay connected to give a heart rate reading of 0 bpm before disconnecting (while i wear it and i am not dead

)
I tested the blutooth connection with my car and the connection keeps dropping when trying to make calls, i managed to make a small call once and the audio was really bad.
I also have a fitness heart rate watch that has shown some issues in testing.
Apart from an increased battery drain over the course of the day i have not noticed any other bugs in my personal use.
I actually have 2 x Samsung J32016 (J320FN) phones and my work supplied mobile is the same device (stock rom) all blutooth features work on my stock rom.
Regards