Hi there,
Thanks for reaching out about this issue with text styles detaching.
These kinds of strange font issues are nearly always caused by the use of conflicting font files across your team. This means that editors on a file are using different versions of the font with slightly different sizing or spacing which then affects the file each time it is opened by someone with a different version.
Our Help Center has more information about resolving this kind of issue: Manage conflicting fonts
We suggest that you have all editors remove these fonts if they are locally installed and then all install the same version locally. You will then need to restart Figma to serve the correct font version. Alternatively, you can ask all team members to delete their local font versions and ask an organization admin to upload the font files as shared fonts (if you are in Org plan). You can read about that feature in our Help Center: Manage fonts in an organization
For your reference, if a local version is installed, Figma will prioritize this version over the organization font and that may trigger the conflicting font issue again.
After installing the font files, if this is affecting component appearance you can launch quick commands (cmd /) then use the ‘Regenerate all instances’ tool to refresh all of your instances at the same time.
(Unfortunately, at this time once text styles are detached, our team does not have any tools to automatically reattach the styles.
If possible, we suggest restoring a previous version of the file before the styles detached or reattaching the styles by using other quick commands such as “select all with same text properties”. We understand reattaching styles requires a large amount of manual effort and appreciate your understanding.)
Additionally, if your text styles do detach again unexpectedly. Please let us know by reaching out directly to the support team: here
This will help us to investigate further. In the form, please also add support-share@figma.com as an Editor to the file and the file’s containing the text styles (this won’t affect your billing at all) to take a closer look. Thank you!