V60 D5 Irregularities in consumption indicator and DrivE

Hello, For a few days I have observed that my V60 sometimes does not display 0.0 L/100Km but some consumption although I brake with the engine (foot from the accelerator) the displayed consumption during normal driving is then displayed significantly higher than usual. (e.g. 9.8 L/100 km at 90Km/h in 6 gear on straight track. This problem “disappears” mostly when the car is parked and read out. (it is enough a stop of 2-3 minutes) The turn on of the engine alone is not enough. Also the DrivE system does not work for several days either. It is not an indicator such as “battery is charged” or similar to see, and the temperatures are about 10-15 °C Does any of you know such problems? Should I greet the ancestor?