I tried to research about it. I have seen that there are a lot of problems with the pcm or stereo whatever you want to call it but mine seems slightly different , my head unit turns off for up to a month sometimes and then it turns on out of the blue and works great for a while then it'll flicker and turn off sometimes it'll come back on the next time I use the cayenne other times it'll work weeks down the road but I have noticed it works more often in the winter then it does in the summer which i found really odd my dash screen always works but flickers a little and the heat/ac acts weird as well it'll go high and low randomly everything started to happen at the same time , could it be a battery issue or something bigger or what?

 

also it's a 2006 porsche cayenne s titanium edition

 

Becker Auto Sound, Maplewood NJ.. they have a website.