It was even worse than that, at least in 4.0.2. You could hit the “Disconnect” button and think that it had disconnected but due to a bug it didn’t really disconnect and leave the system in its normal state. Happened to me too.
I experimented with it some and emailed Terry at Bettershifting.com. He had run into the same issue and sent me the response below. Not sure if they fixed it in 4.0.4.
If it happens to you, you can tell by the lack of the battery icon shown in the upper left corner of the app window next to the “Disconnect” button when you connect. The trick then is to disconnect, then reconnect and the battery icon should show up. Then you can disconnect and all should be well. Or you can just use the phone app or PC v3.4.5
yeah… I’ve sort of had the same issue. I think I know how to ‘detect’ it, but not what causes it.
One day the past few weeks my indoor bike was fully drained, no charge at all. I suspect this is caused by e-tube not disconnecting properly and draining the battery that way.
The next time this happened I made a video of this and sent it to Shimano: https://www.youtube.com/watch?v=_Uyr8JmjEws&feature=youtu.be
When I connect the bike for the first time in the video, you see the ‘battery icon’ is not displayed next to the ‘disconnect’ button.
I think that this is a sign that something went wrong.
In this state I cannot adjust the derailleur indexing, but perhaps more importantly:
If I disconnect the bike (using the button) when it is in this state, then the bike stays connected. You can test this by pressing any of the the (rear) shift buttons. The rear derailleur should move. If it doesn’t respond then the bike thinks it is still connected.
The fix for that is, in my case, to connect E-Tube 4 again. This time it does show the battery icon next to the diseconnect button.
When I then disconnect the app everything works as expected.
So… I’m wondering if you get the same - sometimes the battery icon and sometimes not… and a non-responsive bike if you disconnect when the battery icon isn’t showing.
E-Tube 3.4.5 is still available for download on the official site, but I’ll probably mirror that too, just to be sure