Hangs about once every 12 runs

// Chapter 8 Programming Project #9

#include <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <time.h>

#define SIZE 10
#define PATH_SIZE 25
#define ROW_SIZE ((int) (sizeof(board) / sizeof(board[0])))

int main(void)
{
    char board[SIZE][SIZE] = {};
    // 0 = Up, 1 = Down, 2 = Left, 3 = Right
    unsigned short i = 0, x, y;
    // Generate a random number
    srand((unsigned) time(NULL));
    int dir = rand() % 4;
    // Set all positions of board to '.'
    for (x = 0; x < ROW_SIZE; x++) {
        for (y = 0; y < ROW_SIZE; y++)
            board[x][y] = '.';
    }
    x = 0;
    y = 0;
    board[0][0] = 'A';
    // Generate the path
    for (i = 0; i < PATH_SIZE;) {
            // Check that the last character has not been cornered
        if ((board[x][y - 1] != '.' || y - 1 < 0) &&
            (board[x][y + 1] != '.' || y + 1 > ROW_SIZE) &&
            (board[x - 1][y] != '.' || x - 1 < 0) &&
            (board[x + 1][y] != '.' || x + 1 > ROW_SIZE))
            break;
        // Check the direction and replace that char
        switch (dir) {
            case 0: if ((y - 1) >= 0
                        && board[x][y - 1] == '.') {
                        board[x][--y] = i + 'B';
                        ++i;
                    } break;
            case 1: if ((y + 1) < ROW_SIZE
                        && board[x][y + 1] == '.') {
                        board[x][++y] = i + 'B';
                        ++i;
                    } break;
            case 2: if ((x - 1) >= 0
                        && board[x - 1][y] == '.') {
                        board[--x][y] = i + 'B';
                        ++i;
                    } break;
            case 3: if ((x + 1) < ROW_SIZE
                        && board[x + 1][y] == '.') {
                        board[++x][y] = i + 'B';
                        ++i;
                    } break;
        }
    // Reset the random directions
    dir = rand() % 4;
    }
    // Print the board
    for (x = 0; x < ROW_SIZE; x++) {
        for (y = 0; y < ROW_SIZE; y++)
            printf("%4c ", board[x][y]);
        printf("\n");
    }

    return 0;
}