System temporarily uses all disk space
Approx. every 2nd month, my Mac (MacOS 10.13.1) goes crazy. System eats up all memory:
I am not sure where the space is used. Most probably for Spotlight. But I am not sure. Checking the directory sizes in the terminal didn't help. The used space seems to be nowhere.
After approx. 2 days, the system space starts to go down till after approx. 3 days, everything is normal again.
Any advice?
MacBook Pro TouchBar and Touch ID, macOS High Sierra (10.13.3)