Hello! This is my first laptop, I got it second hand and I took it to someone to clean it and replace the thermal paste. He told me the fan was not working properly and he could change it, which he did. Given the fact that the previous fan was not in good condition, I could not hear it going off when the laptop overheated, but this new one just goes off randomly, even when I'm AFK and not using it at anything, just blank desktop. It also starts the second I move the mouse cursor, but it doesn't usually last long, just about a second, just starts and stops randomly. I am not a computer person, so I don't know stuff. I looked on the Internet and I read something about the CPU and temperature. The CPU can be around 2% and the fan still starts and I noticed it stops when the temperature reaches lower than 45 degrees. This is happening quite frequently, I use Core Temp and it looks like the temperature is spiking quite a lot. I also use a cooler stand. Is this a normal laptop fan behaviour or should I take it back to the repairs? Thank you!