red “blinking” stripes in the Digital Cockpit + Warnton

Hello, when I left the parking lot today, the display showed me a residual range of 22km.So far so good. After a few seconds a rather loud warning sound suddenly sounded and the two “separate lines” in the digital display suddenly turned red. By “separate lines” I mean the upper and lower line.So once above the display of the residual range and the lower one over the total kilometer level.The color changed from the standard grey to red and back. That looked like Just that it changes from grey to red. I first thought that it beats Arlarm, because of the remaining distance, but that was never the case before. Especially since the sound was in the process, completely nerve killing. I at least have no idea what this should be. I had only a short distance from the parking lot to my home.After I had unloaded the shopping and started the engine again, I drove for about 15 minutes so that I could not get back to the car. Does anyone have any idea what this behavior should be?