Hello. I have the same problem. I did unpair and pair on the mobile app.
I also did a factory reset from the "BIOS" menu. Nothing helps. The
right one works fine and the left one vibrates and sometimes tracking
will appear for a second.
I have exactly the same problem. After upgrading to v27, the USB test
shows a speed of 1.1 Gbps. Before the update, it was 2.3 Gbps. On the
first day it was impossible to play. Disconnected every 2 min. On the
second day, after a few disconnections, ...