How do I stop my player from clipping through the floor?

So I'm setting up collisions without using the Platform and Solid behaviours.

In a previous post I got stuck with the WHILE loop, but I found a different way to do it.

My problem is that now my player seems to randomly clip through the floor.

If you try the project and move all over the floor left and right, then after some seconds you will clip through the floor. This seems to happen either in the very middle or towards the edges. But not every time.

Why is this happening and how do I stop it?

Thanks

Project:

drive.google.com/file/d/1uy-mkIu9msmd1Zx5n8kl_CkSLlPOg0R6/view

Never mind, I found it :) Stupid mistake.

I kept adding the gravity to the fall speed and at some point it gets so high that player + fall speed do not overlap with the floor.