Potential infinite while loop?

This code assigns each of the four players a secret role, as well as three fake roles. However, sometimes I click play, and the scene does not open. The play button is still grey, but it will not turn blue to load the scene. I looked it up and the main answer I got was that it could be an infinite while loop. Below is my code which occurs in the start function.

     p1_role = Random.Range(1, 10);
     p2_role = Random.Range(1, 10);
     p3_role = Random.Range(1, 10);
     p4_role = Random.Range(1, 10);


     // prevent repeats of roles

     while (p2_role == p1_role)
     {
         p2_role = Random.Range(1, 10);
     }

     while (p3_role == p1_role || p3_role == p2_role)
     {
         p3_role = Random.Range(1, 10);
     }

     while (p4_role == p1_role || p4_role == p2_role || p4_role == p3_role)
     {
         p4_role = Random.Range(1, 10);
     }

The code also assigns three fake roles per player, that must not match the real role:

     p1_fake_role_1 = Random.Range(1, 10);
     while (p1_fake_role_1 == p1_role)
     {
         p1_fake_role_1 = Random.Range(1, 10);
     }
     p1_fake_role_2 = Random.Range(1, 10);
     while (p1_fake_role_2 == p1_fake_role_1 || p1_fake_role_2 == p1_role)
     {
         p1_fake_role_1 = Random.Range(1, 10);
     }

     p1_fake_role_3 = Random.Range(1, 10);
     while (p1_fake_role_3 == p1_fake_role_2 || p1_fake_role_3 == p1_fake_role_1 || p1_fake_role_3 == p1_role)
     {
         p1_fake_role_3 = Random.Range(1, 10);
     }

This fake role assigning is repeated for each player. The strange thing is, the scene runs totally fine sometimes, but other times it won't open, as I described above.

Big thanks in advance for any help!