MacBook Pro running 10.14.5. My available storage space decreases in real time even when I am not downloading, modifying, updating anything. For example, if I have 8.05 GB available space, I can see it decrease in real time to 8.04, 8.03, 8.02. No, time machine is not enabled. Every time my available space decreases, my system space increases. System is taking up over 100 GB. Sorting activity monitor by bytes written, kernal_task has written 122GB recently.