If your Android phone is constantly dying you may want to uninstall Facebook. According to The Guardian,
A less-than-scientific experiment by Reddit user pbrandes_eth tested the app’s impact on the performance of an LG G4 phone. They found that when Facebook and Facebook Messenger apps were uninstalled, other apps on the smartphone launched 15 percent faster, and found similar results when testing for app loading performance. The Guardian conducted its own experiment and discovered that the Huawei Nexus 6P had 20 percent more battery when the Facebook app was uninstalled. If you choose to uninstall the Facebook app you could always opt for an app called Metal, which “acts as a wrapper for Facebook’s mobile site.” You could also just use Facebook within Chome on Android devices.
Or you could grow up and get an iPhone.