Thermal paste is a heat-transfer layer
Over time, thermal paste dries, cracks, or thins out. When that happens, the CPU or GPU transfers heat less effectively to the heatsink, and temperatures rise quickly.
This is one of the main reasons gaming laptops get louder and lose frame rate stability after repeated use. A proper service restores the thermal path and often makes the machine feel fresher.
It is not always a hardware failure
Dust and poor paste application are common reasons for steady heat problems. Cleaning the fans and reapplying thermal paste can restore a much healthier temperature curve without replacing the whole device.
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