My MacBook Pro turns off without warning

My MBP (13 inch, purchased mid 2010) turns off without warning. It is a 2.4 GHz Intel Core 2 Duo processor with 4 GB Memory running OS X Version 10.9.4. It happens after periods of both short and long use and has been occurring for the last few months. I keep it updated regularly. I have yet to receive a report when I turn it back on that explains the shut down. So far I have reset the SMC and PRAM as others have mentioned that it helps. No luck though. My battery lasts all day, and I don't use my computer heavily. It doesn't feel hot when it turns off either. There is simply an audible "click" and a black screen. Can anyone help explain this? It is getting very frustrating having to constantly worry that it could crash at any second.

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