*********This is the reply from Intel*********
Thank you for contacting Intel(R) Technical Support.
This should not harm the processor as long as it does not overheat. Try to monitor the temperature when this happens. If it is being unused, the heatsink without the fan spinning should be sufficient. If it is getting hotter than 50 degrees Celsius, you should disable the processor fan power down during sleep mode in you BIOS.
Intel(R) Technical Support
So I guess everything is OK.
Tnx, for replying, guys