18.04 – Bluetooth headphones stop audio output after a while, but stay connected to laptop

I have tried 2 different headphones which I paired with my Dell XPS 13 running on Ubuntu 18.04. Every time I play some media in my Chrome browser, the audio output stops working after a while. When I check connectivity, the headphones are shown connected to my computer.

I searched many publications on this topic. I tried Blueman, although it makes no difference to this behavior.