There are rumors out there in the spacefaring community, wallpapered pretty heavily and media/google censored, regarding the astronaut responsible: https://www.newsweek.com/russia-could-take-legal-action-agai...

Basically the full workup describes her having a mental breakdown and just making life up there more and more miserable, saying "take me home or I'll escalate" followed by many cycles of not being taken home and escalating. It includes stealing/losing most tools and equipment and "losing them" to the vacuum of space, drilling holes in the space station, and let us diplomatically say... very poor hygiene related to human waste. The astronaut involved basically quit doing any work. Supposedly this ruined the station and basically assured that it be taken offline.