Realtek WiFi driver eats RAM
The amount of committed memory (as seen in Task Manager -> Performance -> Memory) would slowly grow to unrealistically high values. One time, after it crossed 100GB (I have just 32GB of RAM), it pushed my pagefile.sys into 100GB+ too, which consumed almost all remaining space on the SSD. Neither Task Manager, nor even SysInternals Process Explorer showed anything suspicious, but I still decided to walk through and shutdown unused services. Turns out it was RunSW Windows service by Realtek, that has something to do with USB WiFi dongles (I stopped using one over 4 months ago). I was not able to find how to completely remove the service, but stopping, and disabling it instantly solved the problem (committed dropped to ~20GB), and the system seems to work fine now.