IPhone 4 being really glitchy?

Starting a couple days ago, my iphone 4 randomly started acting up. It had been slow for awhile, and I had a few app crashes, but nothing major.
Now, it constantly deletes all my texts (without warning), loses functionality, drains the battery quickly, and this message saying my storage is full keeps popping up at least twice an hour. I have 4GB available in my storage…
I have tried restoring it several times, and keep having to do this in order to get my messages back. I've had this phone for about a year, and I take really good care of it. I've never had any problems until recently. Not sure what to do?

Mine is doing that too, let me know if you find out how to fix it

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