Question Laptop temperatures suddenly started rising

Aug 11, 2020
I have a Dell Insipiron 5590 with:
8gb ram
mx 250
windows 10

I bought my laptop on September 2019 and everything till June was fine, the temperatures were never too high to make the fan start spinning which makes a lot of noise for when I'm studying. So now even when the laptop is idle and I'm doing nothing, the temperatures start to go around 60°C which triggers the fan permanently and the temperatures stay around 50°C but with the noise of the fan. I thought the problem was with the fan, so I sent the laptop back to Dell and they replaced it, but I still had the issue. I decided to repaste the cpu and gpu with arctic silver 5, but still with no succes. Can anyone help me?