BUT, if at the same time WLAN running, then drop outs in data transmission. For example, a video is streamed via Wi-Fi and the headphone is located near (must not be connected to the device that the video receives, spatial proximity is sufficient), there is continuous transmission interruptions during video reception. If the headset turned off, everything works as it should.
I have another BT headset that does not have this problem.
(Perhaps it was also a Monday device or the frequency separation BT / WLAN is not correct)