Player randomly stops moving

Hi, I’m making an infinite 2D runner and have a problem when player’s velocity randomly drops to zero and if I hit any button (jump or fire) he continues to move but stop again after a while. Here’s a code with player controls.

public class PlayerControl : MonoBehaviour {

	bool isGrounded = false;
	public Transform[] groundCheck; 
	public float groundRadius;
	public LayerMask whatIsGround;
	public float speed;
	public float jumpForce;
	public GameObject bullet;
	private bool jump = true;
	private bool grounded;
	private Rigidbody2D player;

	void Start () {
		player = GetComponent<Rigidbody2D> ();
	}

	void Shoot (){
		Instantiate (bullet, transform.position, Quaternion.identity);
	}

	void Update(){
		if (Input.GetKeyDown(KeyCode.Space))
			jump = false;
		
		if (Input.GetKeyDown(KeyCode.Mouse0)){
			Shoot();
		}
	}

	void FixedUpdate () {

		player.velocity = new Vector2 (speed, player.velocity.y);

		foreach (Transform point in groundCheck) {
			Collider2D[] colliders = Physics2D.OverlapCircleAll (point.position, groundRadius, whatIsGround);
			for (int i = 0; i < colliders.Length; i++) {
				if (colliders *.gameObject != gameObject)*
  •  			isGrounded = true;*
    
  •  	}*
    
  •  }*
    
  •  if (!jump && isGrounded) {*
    
  •  	player.AddForce (new Vector2 (0f, jumpForce));*
    
  •  	isGrounded = false;*
    
  •  	jump = true;*
    
  •  }*
    
  • }*
    }
    Do you have any ideas how to solve this ??

Nevermind. The problem was in some badly instantiated colliders.