9070 Front D ghost shift

[ParisCarbon]

Ive been having an issue lately (more often) its happened before... a course I ride on has a set of train tracks. Ive cross the tracks a few times riding in my 53X17 or 16 cog, and the bump over the track has caused the FD to drop to the 39... today we had a race out on the same course... we got stopped by a train on the 2nd last lap, and they bascially called the race but said we culd just race to the finish from the tracks.. well before I even got clipped in, my Di2 shost shifted on its own to the 39 as I watched everyone sprint away.. all firmware is current.. its been in the shop and shifts perfectly fine... any thoughts?

[pdlpsher1]

How’s the battery level? When the battery is critically low the FD stops working first to leave enough juice for the RD. Also the ‘brain’ of the Di2 is in the battery. It could be the battery/brain is defective. Perhaps try a new battery as a last resort.


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[ParisCarbon]

Hi,
Batt level is good.. this has happened in the past (same battery)..
Thanks