My XPS15 9560 has stopped to charge with the original 130w charger. However, it still charges using the thunderbolt  docking station.  This symptom has already happened 6 month, and the service team supplied a new charger, which has worked for about 6 month, but now has stopped functioning. I have purchased another 130W charger, but this one does not charge at all, although the control LED is on in white, whilst plugged. I also see the charging symbol in the display , but no charging occurs.   Any advise ?