I had a 2017 MBP and the USB speakers I had caused issues. I sold them thinking it was an issue with the speakers, but the next set of USB speakers had the same problem. Eventually, I just used AUX to connect them.
The sound issues I've been running into are not limited to a single type of output. When the sound is out on my computer it is out for internal speakers, Bluetooth, HDMI, USB, and 3.5mm AUX.
