FPS drops randomly - Legion pro 7 16IRX9H (RTX 4080 - i9-14900HX)

Note the following problem only occurs in balanced mode:

Ok so, when I launch a game, my gpu usage is between 97-100% (and clock is around 1800-1900mwh), which is normal and the fps are excellent. However, after some time, it really depends, 10 mins after, 15,20 etc, i have suddenly fps drops. I check gpu usage, it's now between 60-85% and the clock is almost stuck at 2100mwh.

E.g: Horizon Forbidden West at normal fps is 80 fps. When problem occurs, around 60-70 and not smooth.

The only way I found to fix it is to switch to performance mode, then back to balanced. Then, it returns to normal, but again, after some time, fps drop.

Any solutions? Thank you

Note: dgpu enabled.