I have a Dura-Ace 12-speed Di2 system with the shifters set up wirelessly. Left Di2 button configured to previous page. Right Di2 button configured to next page. However, about half the time after starting the 840, pressing either button skips a page and jumps to the page after. For example, if I am on page 1, pressing the right button goes to page 3. It takes a power cycle of the 840 to resolve this. This issue has persisted across several firmware releases, including beta and production. I have not established the sequence of events that trigger this behavior but this is typically what I do before each ride:
- Power on the Edge 840
- Rotate the crank arm on the Quarq DFour91 power meter to wake it up
- Press the shifter buttons (not the bonus buttons) on both shifters to wake them up
- Sometimes I also press the bonus buttons but this is more as a check to make sure the issue is not occurring
