Hi Mariusz,
thanks for using the forum. To your problem, this looks like an error thrown from our cloud infrastructure from Amazon Web Services.
For some reference, here's a page from AWS on describing the spot instance interruption: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/spot-interruptions.html
For your case, could you try to restart the processing once again and see if the processing can finish normally?
If it doesn't, please create a support case via our portal or by sending one email to support@navvis.com.
Usually our forum is used for discussion of broader topics that is visible to the public audience, and for issue that requires logs, data etc. we switch to the support case where we could handle faster and easier.
Best, Youlin