Wall light solar no longer following light schedule "dusk to dawn" turns off after 15 mins

We use our wall light solar to stay on from dusk to dawn. We don't use it for motion detection. It worked really well for a long time, but now with the light schedule the light can only stay on a maximum time of 15 mins. maybe there was an update made? how can i turn this off. no matter what i do the light will not let me force it to stay on longer. This is a real problem for us. I even removed the light and re initialized it on the app, charged the battery and set it up as if it were new. same problem. please help!