LH-18A1H(DVD940i) LOCKSUP

I have an HP DVD940i that I flashed that now shows ups as a LITE-ON LH-18A1H. The flash has been fine until just a few days ago. Now when I try to burn the Driver/Computer locks. I am not sure which one. Today it locked up the machine when it was just trying to read not write. I am not sure if the drive is failing or not. Any idea would be great. Thanks