Why does my beloved all of a sudden now blink pink??

I have had mine for almost a year. I know when it needs to charge or be filled. Lately something has changed. It is charged. It is full. The coil is not old. It just blinks pink and then nothing else will happen. The only thing I can think of is that i left it in my car when the temperature got below freezing. Anybody have any advice or knowledge??
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