Games on my laptop lag every few minutes for 10 seconds

It happens in every game but it mostly bothers me when playing Dota 2. After some (short) time playing it starts to lag for some time and then goes back to normal and then that repeat through all game. Normal FPS is 110-120 but at these moments it is 25-30. It doesn't matter what graphic settings i play on.
Specs:
Alienware M17X R2
Intel I7-940XM
8gb RAM
2X HD5870 1GB GDDR5
HDD Hitachi 500GB SATA 3
When it started to happen i cleaned the laptop inside and changed the thermal paste but it didn`t help. So i also deleted Windows 10 and installed Windows 7 but nothing changed.
2 answers Last reply
More about games laptop lag minutes seconds
  1. First thing that comes to mind is overheating and the laptop throttles down to preserve the hardware.
    Seocnd thing that comes to mind is HDD going to sleep mode.
  2. cats_Paw said:
    First thing that comes to mind is overheating and the laptop throttles down to preserve the hardware.
    Seocnd thing that comes to mind is HDD going to sleep mode.


    Temperature isnt even close to temperature before cleaning. (is lower than before cleaning)
    HDD going to sleep mode? Can you please tell me more about it? Never heard of it.
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