My Macbook Pro (2010, 10.9.5) turns off by itself randomly

Hi all
My Macbook Pro (mid 2010, 2.53 GHz, ram 4GB, Intel Core i5, Mac OS 10.9.5) turns off randomly while I am working. The screen turns black and I get a message that my "mac was turned off due to a problem". It turns on again and all seems normal. I haven't lost anything (yet), but it happened three times in the last 10 days and I am getting very nervous. Last time it happened I was working with MS PowerPoint, MS Office, Preview and Firefox. I repaired disk permissions, restarted and I am preparing to empty the system cache. I have Avast-antivirus installed on my mac. Any other suggestions?
Does anyone else experience the same problem?
Thanx i advance
Stavrinski

Thanx for the prompt answer. I checked the link and it could be the case. But my machine is 4 years old and- if it is a hardware issue- is not covered for repairs from Apple
I really don't want to mess with Apple service, it is expensive and takes an eternity...
Followed your tip and uninstalled Avast, although it has repeatedly located and blocked malware on my mac...
BR

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