Question CPU stuck at 0.40 GHZ when on High Performance

[Jimcuchim]

I have a i5-8520u
4GB of RAM
No graphic card
And a 256GB SSD.

I noticed huge amount of lag when playing games last week and found out that my cpu is capped at 0.4GHZ whenever I switch to balance or High Performance. In power saver, the speed gets up to 0.80 GHZ. I restored every default settings of the power plans but nothing worked. But I found out using intel power gadget that the voltage actually increase when I'm on High Performance. What happened, is there anyway to fix this. Normally my cpu on High Performance will be at 3.4GHZ.
Thank you,

 

[sizzling]

What’s your cpu temperature?

 

[Jimcuchim]

Sorry for the late reply but my temperature was relatively low, about 60C. Thank you for replying.

 

[Viking2121]

Are you using the right power brick? I've seen failing power bricks cause low CPU clocks on Dell laptops mostly, Make sure the power brick you are using is the one that came with the laptop or one thats rated for that laptop.

 

[Jimcuchim]

Thanks for replying. I actually kind of fixed the problem somehow, I didn't use my laptop for a week and then when I turned it on again, it worked normally now. Thanks anyway