Ok. I use the R8070 with the EW-WU111 but there shouldn't be any difference. My connection between the edge and the Di2 is stable.
I think that’s right I have lots of sensors (lights, power, di2, heart) connected but they are all ANT and I have had no real problems day to day for the last 6 months. The Di2 hidden buttons work brilliantly as a remote. The problems with the 1030 all seem to be Bluetooth related.