Hello mates, I am having trouble with my solaris 11 OS root file system. The problem is when I reboot the system, the root file system fills

My actual space is 147 GB and the root file system shows 83% after reboot, as soon as the system is rebooted, the space gets filled to 100%. I have checked the /var, /temp and all other directories are 1 to 2%, the / directory starts to fill up in a couple of minutes ironically.
Could anybody please kindly help me in this regard?