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Default case causing infinite loops in game

zyx459 (3)
I'm making a tic-tac-toe game. everything works fine(this is a small portion of the program), but if a letter is entered then the program goes into an infinite loop. Something is wrong with the default case. I set x equal to false, so it should loop this portion of the code, but not infinitely. I've also tried replacing the "x = false" and "break;" with "return 0;". This terminates the program if a letter is the first thing you enter, but if you enter a letter after your first move then it goes into an infinite loop again. Could someone please explain why this is happening.

FYI: I have the do-while loop and if-else statements in there so that if the player tries to move in a spot where there is already an 'X' or 'O', then the program will loop this portion and ask them to move somewhere else.

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 //Player move
				do
				{
				cout << "Where would you like to move? ";
				cin >> PlayerMove;
				switch (PlayerMove)
				{
				case 1:
					if(box1 == 'X' || box1 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else if(box1 == '1')
					{
						box1 = 'X';
						x = true;
					}
					break;
				case 2:
					if(box2 == 'X' || box2 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box2 = 'X';
						x = true;
					}
					break;
				case 3:
					if(box3 == 'X' || box3 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box3 = 'X';
						x = true;
					}
					break;
				case 4:
					if(box4 == 'X' || box4 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box4 = 'X';
						x = true;
					}
					break;
				case 5:
					if(box5 == 'X' || box5 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box5 = 'X';
						x = true;
					}
					break;
				case 6:
					if(box6 == 'X' || box6 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box6 = 'X';
						x = true;
					}
					break;
				case 7:
					if(box7 == 'X' || box7 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box7 = 'X';
						x = true;
					}
					break;
				case 8:
					if(box8 == 'X' || box8 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box8 = 'X';
						x = true;
					}
					break;
				case 9:
					if(box9 == 'X' || box9 == 'O')
					{
						cout << "You can't do that. ";
						x = false;
					}
					else
					{
						box9 = 'X';
						x = true;
					}
					break;
				default:
						cout << "\nYou can't put letters in this program.\n\n";
						x = false;
						break;
				}
				}while(x == false);
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