I have a solar pathlight that keeps going offline without warning or explanation and doesn't go back online until I remove and readd it to the app, then it eventually goes offline again. It lights up when it detects motion but does not glow from dusk until midnight like my other lights do. It went offline Tuesday morning. I readded it that night, then it went offline again Wednesday morning. The battery is at or near 100% at all times. Any ideas?