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my made with out any reason turn off in the middle of my work happend some time two time together and other one only and now start some of the fan i no idea is left or rigth very accelerate and stay 5 o 6 minutes work very fast with out stop happend several time a day and other day no happend this drive me crazy , help please

It may be overheating and shutting down to protect itself. Open it up and use some canned air to blow the fans out. The vents may also be clogged and need to be cleaned. This failing, replace the thermal paste. Arctic Silver Thermal Paste