The first time with the Phaeton on vacation and the Super-GAU immediately… I drive back after a problem-free holiday on Lake Garda and notice already after a short time that the voltage indicator varies dangerously. Air conditioning is switched off, consumer electronics also. Nice message in the infotainment display. Shortly afterwards directly before the splügenpass in the tunnel fails me the dipped light, all displays dark. After all: Analog ads continue to work, in a Phaeton you can still no At the top of the pass I look through all the fuses, measure the voltage of the comfort battery (12,8V), with twitching shoulders I turn on the ignition, everything seems to work, no error messages. I run the car in the stand gas, after at least 30min still everything is fine. Decide to continue driving and come another 200km to home but with several messages from consumer shutdowns. Strangely, vary the battery display sometimes as with a mass problem, then it rises again to the usual 14V and stands there sometimes 20min constant, the climate also switches on again by itself. At home I charge all batteries fully and make a test drive. After 15min the game starts again. Home to the test run the car on P, indicator jumps back immediately to 14V. Then I switch off the engine, leave the ignition on and test all consumers, everything works. What do I do? battery seems to be fine, but maybe a mass problem with a consumer who only runs while driving? Or the charge controller has a shot? Did anyone ever have a similar problem?