Just had this happen. I was just watching some YouTube when I started hearing my CPU fan going loud for no reason. Looked up up Task Manager and first thing that popped was 80% of my 32GB RAM was in-use, most of it by "Feeds". CPU usage was high too, it was doing something.
Windows 10 21H2
MSI B550 Gaming Edge WiFi
Ryzen 5600X
AMD 6600XT
32 GB of Corsair RAM (four sticks)
NVME M.2 1TB SSD
RM750x PSU