Same symptoms here whilst running 3.0.0.5 and after factory reset.
Connecting to Samsung Gakaxy S9+ and Surface Book 2.
Thank you for the reply.
- The hissing noise is not constant. It appears when the channel is open - I unlock the phone, I'm about to play music, or make a phone call. Even if I do nothing, the white noise persists for about 3 seconds then shuts off. It seems that the noise comes from the earbuds anticipating having to play back something and it could be from one earbud establishing a communication with the other.
- I have a Google Pixel 3 XL and a Surface Book 2 laptop. It occurs with both devices.
- Any apps will trigger the hissing - it appears to be connected with establishing anticipation of audio broadcast - phone call, music, video, or simple waking of the phone.
- Surface Earbuds' firmware was updated immediately upon receipt. Firmware version 3.0.0.5