You might open a ticket at
https://github.com/darktable-org/darktable/issues/new?assignees=&labels=&template=bug_report.md&title=
Please follow the description there to provide the information needed to
reproduce the issue.
Based on your current description thereās only one answer: it terminated
3.4.0 is now in Fedora / CentOS / RHEL updates testing
https://bodhi.fedoraproject.org/updates/?packages=darktable
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