Yes, Studio One from 3rd version is still unstable as hell. Sometimes I spend hours to just get into the project: freeze on project loading, freeze in projects, crush on plugins remove, freeze on project saving, freeze on closing project, freeze\no sound on playback, random crushes and countless other situations. It's totally kills the creativity.
I have powerful CPU, plenty of RAM, SSD drives for system and projects and nothing in system is wrong, until I open S1.