Chrysler Stratus 2.5 JX Cabrio – Help about a small problem

The following happened to me: I went shopping. When driving home suddenly the ABS lamp lit up, about 2 minutes later the battery control light. At the same time the entire speedometer unit had several small dropouts (not even 1 second). I drove right up, turned off the engine – but then the car was completely TOT – nothing was left, no ignition, no lighting, no electric seat adjustment, nothing at all. I called the breakdown service and a little later I tried Nothing again. Only when I once moved the automatic lever back and forth (i.e. from P to D and again to P) everything was there again. Since then it has been running as if nothing had happened. Does anyone know the problem? Someone an idea what that could be? Could it be that there has been a power interruption? Thanks for the answers! Mfg Freddy