im having the same issue and i have been searching for a forum post for a while now and only jsut seen them start to appear.
when i plug mine in, it will display the "Plugged" symbol on the battery display but not actually charge. the battery will still decrease. then it will randomly "disconnect" and not register that it is plugged in. then appear to be plugged in, then not, then plugged in, then not.
This will repeat over and over again without actually charging and the charger being in the socket throughout.
however yesterday i left it plugged in and my battery was 9% and after the strange plug in behaviour i noticed it was charging normally after about 20 mins in the car.
But when i did the same journey time today, the battery wouldnt register at all....
No idea whats up with it...
anybody else help????