XPS 13 9360, "plugged in, not charging"

Hello and Merry Christmas, 

I purchased the XPS 13 9360 in January 2017 and I am receiving the "plugged in, not charging" error. The AC charger that I am using is 45W and purchased from the Dell website.

This is the second time this has happened since I bought the laptop. In June 2017, I received the "plugged in, not charging" error and purchased a new charger from Dell ("Dell Power Adapter Plus - 45w" for $60). There were no issues until October 2017. I see the same "Alert! The AC power adapter wattage and type cannot be determined. The battery may not charge. The system will adjust the performance to match the power available." message when I turn the computer on while plugged in.

Please advise if this is normal or if I have received a faulty laptop or chargers. I would prefer not to buy a charger every 6 months. Also please advise if either my laptop or my new charger is under warranty and how I can proceed to from here. 

Sincere thanks, 

rajeevanm