Sprite that stops moving for no reason

Hi everyone, I'm trying to make a 2D platformer. I noticed that the player's sprite, sometimes it get stuck, and can no longer move forward, as if there were an invisible wall. The problem seems random. Usually it does soon after the start of the level, I move the player to the right and then change direction to go left. In this way you see the sprite trying to move to the left (the animation works), but it can’t move forward, as if there were an invisible wall. The only way to go left is to jump, in fact, even if I go to the right and if I go back I'm stuck by the invisible wall. I also tried to remove the script that manage the camera, but the problem persists, so it's not a scrolling problem. What can it be? Has this already happened to anyone?

Thanks for your help

 

If the player has box collider2d, then try with capsule collider 2d

 

Great! Thank you very much! It works!