BMW 118d 2006 HELP PLEASE

[Alfiexxx]

We've got a BMW 118d 2006 plate. Yesterday whilst driving all the lights started flashing on the dash, the odometer and speedometer wouldn't work, the car did not loose power though. And the radio started flicking on and off, today it has happened again twice. Is there any ideas of what it could be? Battery has been checked and that's absolutely fine.

Thank you