Have you ran memtest86+ from the cold boot state?
Do this with the 2GB RAM card installed only and then again with only the 4GB card installed.
You can stop the test if you see any errors.
When you ran memtest86+ before was the laptop already warm?
Did you run a full 7 passes?
Your CPU core temps are high, What are you using to get the temps? Use Real Temp
You can test your CPU at the cold boot scenario with the Intel® Processor Diagnostic Tool