Audio devices change themselfs (Win10)

Good morning,
I use Jitsi 2.11.5611 and Windows 10 1803 x64; sometimes I cannot hear due to an automatic and random change of the speaker device. I have already updated Windows, Java and audio drivers.
I have installed Jabra Evolve 20 headphones and Conexant ISST Audio Controller.
Has anyone already had this problem?