might indicate a problem with the battery.
I recommend taking your laptop and charger to the Apple Store to be diagnosed:
You can get your device serviced by contacting Apple Support, or by visiting an Apple Store or Apple Authorized Service Provider next to your place:
Start a service request: http://getsupport.apple.com/GetproductgroupList.action?locale=en_US&caller=sfaq& PRKEYS=PF9
Find an Apple Authorized Service Provider: https://locate.apple.com/us/en/
Make an Apple Store appointment: http://www.apple.com/retail/geniusbar/
Contact via phone: https://support.apple.com/HT201232
Contact your carrier: https://support.apple.com/contact