Rotation Locks at 90 or 270 degrees

Hey everyone,

I'm coding a space ship object the player can rotate, and due to some weird behavior from the rigidbody's torquing, I'm rewriting it with localEulerAngles. So far it all works perfectly, except the X axis pitch.

What is happening is once my ship gets near 90 or 270 on the X axis, the X axis locks into place at 90 or 270 and I'm only able to rotate around the Z axis. I've made sure that nothing else I've written is interfering with this code by putting it into another script object, but it still does this. Is this just a quirk of Unity? Is there a way to address this?

 public var rotationThrust : float = 0.3;  // The thrusting power for rotation
 
 private var rot_Pitch : float;
 private var rot_Yaw : float;
 private var rot_Roll : float;
 
 function Update () {
 
     // ROTATIONAL THRUSTERS
     var p = Input.GetAxisRaw("Pitch");
     var y = Input.GetAxisRaw("Yaw");
     var r = Input.GetAxisRaw("Roll");
     
     if (p)
         rot_Pitch += rotationThrust * p;
         
     if (y)
         rot_Yaw += rotationThrust * y;
         
     if (r)
         rot_Roll += -rotationThrust * r;
     
     // ROTATE SHIP
     transform.localEulerAngles.x += rot_Pitch * Time.fixedDeltaTime;
     transform.localEulerAngles.y += rot_Yaw * Time.fixedDeltaTime;
     transform.localEulerAngles.z += rot_Roll * Time.fixedDeltaTime;
 
 }