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When I had this, I thought it was the battery or shifter, but it was a separate connection (inline Bluetooth module) that was loose. Often popped out when turning the bars further than usual to put in a car etc.
cjr-
I managed to disconnect cables inside my frame by catching one where it came out of the chainstay. The irritating thing about it was it disconnected the cable from the bars to the internal junction box not the one connecting it to the rear mech that I pulled.
Clumsy removal of a wheel leads to an hour of dicking around taking the bike apart and reassembling it.
atz
Bear with me while I try and describe a perculiar Di2 problem which has just cropped up recently...
Changed my seatpost a couple of weeks ago (obvs requiring disconnecting the battery and reconnecting it). A few days later I go for a ride, but no gears. The battery seems properly connected to the wire inside the seatpost, but I disconnect it and reconnect it anyway using the tool. Yay, gears. Off I ride. A few days later, another ride. No gears again. I disconnect and reconnect the wire going into the battery, and I have gears, but this time the indication light on the junction box is red. I'm sure it was green before. Red but not flashing is alright, isn't it, so off I go, only for the gears to totally stop shifting after 2km. Didn't even chuck me into the little ring. Go home, start charging and after 2 hours or whatever, everything seems fine. Every connection I can get to on the bike seems okay, nothing dodgy. Overnight the battery keeps charge and the indication light is still green, so I go for a ride. All fine. That was yesterday. Now I think "oh I'll check my Di2 again" and... it's dead. WTF is going on? I'm going to need to bung it into a shop, aren't I?