Why does my Doro PhoneEasy 618 keep saying no memory?

About 10 days ago my Doro 618 started saying No Memory about once and hour precede by a single beep. It maintains charge well and everything works normally. No data is missing. It takes photos and uploads them. I cleaned out old text messages. What could be the cause?

Try to restart the phone after freeing up some space to refresh storage. Let me know how it goes.

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