Everything seems to be working smoothly for the last couple of days, so maybe indeed it was a transient issue. Don't know if you heard back from Transkribus, but hopefully these types of interruptions do not happen too often. Feel free to consider this task resolved.

Thank you for adding this. I think the extension configuration still needs to be updated to reflect the new model for Swedish. I guess this line should read "swe-3".

When it crashes, is it quick to crash or does it take some tens of seconds?

Thank you @PMenon-WMF. That makes a lot of sense. I created a request for the successor model version 3.0, see T344349.

Don't know if anything was changed, but this seems to work fine now.