Did the host try it in single player?
Please email supportdos@larian.com, with a description of the problem and the report.zip file generated by the
D:OS support tool (for the PC version). The report will contain your saves, so should help Larian identify the issue. If file size is a problem, you can delete older saves, or ones from other profiles (the most relevant being the most recent working save and the oldest that you can not return to the End of Time).