Headset automatically turning off

I am using the headset in conference calls and 3 times now in the last 2 days did the headset turn off suddenly. It turns on again after a few seconds, almost like it reboots
I have the setting “Auto Turn off” set to never
I am using firmware 2.1.112

This is very annoying and makes the use of the headset impossible in conference calls …
I am not a happy user right now !