Apple has started a recall on 15 inch MacBook Pro laptops with batteries that could pose a fire hazard. These laptops were sold “primarily” between September 2015 and February 2017. To see if you might be affected, check this Apple page. You will be asked to enter your serial number. You can find your serial number by selecting “About this Mac” from the Apple menu.
Before taking your computer to Apple, make sure it is backed up completely with Time Machine or another backup application.