Headphones disconnect when I recieve a notification on the Vivomove Sport

Hi,

I have a new Vivomove Sport, updated with the last firmware.
Sometimes when I'm listening to music on my headphones the connection to the headphones gets dropped the moment I receive a notification on my watch.
This only started happening since I started wearing the watch.
Thus I suspect a sort of interference between the watch and the headphones

The headphones are Sennheiser Momentum 4. I can only reconnect them after a full reboot.
My phone is Samsung Galaxy A53, and I use Garmin Connect to manage my watch.

Did anyone encounter this problem before?
Is there a solution available?