Why is my Samsung Galaxy S3 incredibly slow?

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Samsung Galaxy S3 incredibly slow.

I have had my Samsung for about a year and a half and it has been extremely slow for about 6 months, I have factory reset the phone at least 4 times and it continues to be slow. I haven't got many apps on the phone and only 23% of the memory is being used. The last few days it has become intolerable with it constantly restarting itself, not allowing me to answer calls and constantly crashing.