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#11
As RAM sticks are showing errors, you have to change those. You may either try to determine which stick is bad actually by following the Part 3: If You Have Errors: of the tutorial RAM - Test with Memtest86+; or just plan to replace a new kit.
After this replacement, if those crashes continue to occur, you may need to perform the further tests. But, upto that point, let us know the results with the replacement RAM.