Not really sure what the problem is yet but it sounds like it's burning propellant at a higher rate to keep it sun-pointing until they find a way to recover it. The long light-time delay is making it difficult.
http://www.cnn.com/2016/04/10/tech/nasa-kepler-emergency-mode/index.html
http://www.cnn.com/2016/04/10/tech/nasa-kepler-emergency-mode/index.html