Bluetooth headphones problem

Hi, I'm using my fenix 5x plus with mp3 music and Bluetooth headphones. The thing is that sometimes there are small interruptions of the music I guess due to a bad connection. It's quite annoying. I've tried with two brands of headphones (not high quality headphones, I must say) and the problem is the same. Has anybody the same problem? I'd like to discard a Fenix problem before buying a better quality headphones.
thanks