Aeon ZW095 kWh value rapidly alternate

[JanCeuleers]

I have a couple of ZW095 devices, and the energy values they report rapidly alternate between two values. One of the meters alternates between 5650.976 kWh and 2754.673 kWh, while the other alternates between 335.440 kWh and 8889.450 kWh.

By "alternate" I mean that the readings from both energy meters, as displayed by Domoticz's dashboard, might be stable for several seconds on one of these values, then randomly and rapidly switch back and forth between the two values shown. This only affects the energy reading from these meters, i.e. not the voltage, power and current readings.

The meters have been reset to factory settings.

I would be grateful for any hints.