I am now quite sure what is causing the dropouts. This afternoon, I lost contact with my HA’s. I sat at the pc desk, and tried to reconnect the HA’s to the Phonak app, but that didn’t work, and I tried several times. However, the ‘strong’ BT for connecting the stream of music did connect, but not the LE (Low Energy) BT. Because I had read about ‘interference’, I went to the sitting room and tried once more - the connection was made immediately and everything worked as it should.
Later today I had to wait for some time in my car, I listened to music for about 20 minutes, and everything was okay, without any dropout. And, I want to stress this, the sound was overwhelmingly good. So it seems clear that the environment is very important when you want the LE BT to stay connected. At Google Play many complain that they cannot connect the app (the new Phonak app that is) but in my view the new and the old app have to be in surroundings as free from interference as possible to stay connected.
I am not sure if the smartphone can cause havoc or blessing to this process by having more, or less, influence on the interference from other sources.