I am having a really weird Di2 issue. I have two 11 speed Di2 bikes, one is a few months old and the other I’ve had five years. I’ve never had any problem with either until the last few days. First, I found the new bike was flat. I hadn’t ridden it for a while, so I charged it up and since I had the charger out, I charged the other one as well. A couple of days later I went to ride the new bike and it was flat again. I’ve done some investigating and without the EW-WU111 bluetooth device, it holds charge. With it installed, it loses 20% in a couple of hours. So at that point, I’m thinking I just need to replace the EW-WU111.
However, today I went to ride the other bike, which has never given me any trouble and despite having been charged last week, it too was flat. I haven’t yet worked out what the problem is, but I’ve removed the EW-WU111.
Is there anything that can make both of the systems have issues simultaneously? I may have updated the firmware in either or both of the bluetooth devices, because I used the old one on the new bike before the new one arrived and I updated the firmware via the PC app. Alternatively, is there anything in the bluetooth environment that could make this happen? It seems really odd that it has happened simultaneously, including one bike that has been rock solid for five years. Thanks for any advice!