RE: XPS L502X COLD FREEZES
I would suggest you to boot the system up in Safemode with networking mode (F8 during startup) and check the system functionality.
Also, please run the CPU Stress test on the system in the safemode using the steps below.
1. Open the link http://dell.to/14YjKb2
2. Select ‘Hardware’ under ‘Let's diagnose your issue’.
3. Select ‘CPU Stress’.
4. Click on ‘Run Diagnostics’ button.
5. Let me know if the results.