Not necessarily idle. In my case it crashes 30 seconds in every time, no matter how far I've gotten in the process.
Thanks for creating a new issue.
Fixed in the following steamvr beta release:
https://steamcommunity.com/games/250820/announcements/detail/1697188731109135045
Nothing extracted yet.
Room Setup segfaults after being idle for a few minutes.
Separating this issue from #105