This was clearly a memory leak issue… However, I don’t know how to reproduce it. I post here just to let you know that Unity Hub has this kind of issues. I didn’t know that Unity Hub was leaking memory until I gradually felt that my computer was getting slower and slower…
I am using Unity Hub 3.2.0 and Unity 2021.3.8f1.
this also happend to me, except i just opened the hub for the first time and opened a lot of CMDs and started using all my RAM
using a old version of the hub fixed it