Sudden frame rate drop in 2020.3.0f1,Sudden drop in frame rate in 2020.3.0f1

Sudden fps drop in unity editor in play mode the fps is 60 and then it drops below 20 for a second and goes back to 60 and drops again continuously resulting in a lot of lag.(in unity editor play mode)

I just have a player a simple maze with materials and footsteps audio.

But the strange thing is that when I build the same game it runs 120 frames per second. Whereas in unity editor the game runs at 60 fps and drops to 20 fps.

This is my laptop specifications Edition Windows 10 Pro Version 20H2 Experience Windows Feature Experience Pack 120.2212.551.0 ,I am making a game in 2020.3.0f1 and I am receiving sudden frame drops for a second like from 60fps to 20 or below and then it goes back to 60 and it happens after few seconds again continuously in the unity editor in play mode.

I don't have much in the scene just a simple maze a player and footsteps audio.

But for some reason when I build the game it runs 100 - 120fps with no frame drops.

So everytime I want to test the game I have to build it which is time consuming. This is my laptop details Edition Windows 10 Pro Version 20H2 Experience Windows Feature Experience Pack 120.2212.551.0

Can someone please help me?