Dell Precision 7510 Shutting Down

Several possible reasons -Your computer is triggering a shutdown to protect from thermal damage. Cleaning it is good, but your fan may not be working adequately to cool your processor because it is failing.Check the air vents of your computer not just the fan just in case, Your hard drive is overheating or failing. Check the Event logs to see what they say. If you have a long list of hard drive errors, you may have a failing hard drive. Also, the heat sink flux that connects your cpu and processors to your cooling devices may have dried up/worn off if your computer is old. Also, your computer may not be up to what you are asking it to do, and the continual over processing is causing it to overheat and trigger a thermal shut down. Take it to a tech to have diagnostics done or consider upgrading.