Uconnect 4.3 delayed initiation
 

Hi,
my Uconnect 4.3 unit doesn't start immediately after starting the engine. The screen is blank, the buttons, the radio don't work. Sometimes the front and rear windscreen heaters are on, sometimes are not. The Uconnect boots up 1 - 5 minutes later. The clock, the language, the units are reseted. The error only occurs in the morning. After this delay the device works properly all day.
The car is a 2014 Charger SE. The problem occurred two weeks ago. I think this is a power supply problem. The battery is 1 year old. I tryed charging the battery but without any result. The voltage is about 12.4 V before starting of the alternator.
Do you have any idea?