I have a 5-year old set-up that has worked smoothly until ~2 weeks ago. Running a 6870 FD with 6870 RD, and using DN110 battery and 9150 shifters. Until ~2 weeks ago, I hadn't updated the firmware for three years.
Trouble was that the FD refuses to shift both up and down in the middle of the cassette range, this despite of a fully charged battery. I'd click a shift button, and there would be no response at all. If I then hold down the button, I get a solid green light. But for whatever reason, if I want to shift to the big ring, with the chain originally in the middle of the cassette, shifting the rear to the 13T cog followed by a click on the shifter will shift the FD. I experience a similar issue when trying to shift down the FD, and it works only when I shift the chain to the 21T cog.
What's weirder is that this never happened before, and to rule out things, I updated the firmware a week ago. For one week, the issue went away completely, but it has since returned yet again.
Anyone knows what the issue might be? Many thanks in advance.
Trouble was that the FD refuses to shift both up and down in the middle of the cassette range, this despite of a fully charged battery. I'd click a shift button, and there would be no response at all. If I then hold down the button, I get a solid green light. But for whatever reason, if I want to shift to the big ring, with the chain originally in the middle of the cassette, shifting the rear to the 13T cog followed by a click on the shifter will shift the FD. I experience a similar issue when trying to shift down the FD, and it works only when I shift the chain to the 21T cog.
What's weirder is that this never happened before, and to rule out things, I updated the firmware a week ago. For one week, the issue went away completely, but it has since returned yet again.
Anyone knows what the issue might be? Many thanks in advance.