edge lighting notification not working

I have sprint model. When I get a text or call notification with phone upside down, the lock screen and capacitive buttons light up for a split second then the edge lights up according to it's configuration. It too lights up for just a second then the lock screen comes up thus canceling the edge before it gets started. Settings appear correct. Accelerometer works fine. No settings in regards to controlling the capacitive buttons or lockscreen from lighting up during an edge lighting notification. Not rooted ,completely stock using stock sms. Any help appreciated