Greetings,
The crash is a known issue and we are working hard to iron them out. Thank you for the feedback and patience.
Once crash happens again, could you please locate output_log text file in the game flies (Games\Ultimate Admiral Dreadnoughts\Ultimate Admiral Dreadnoughts\default\game\build_Data) and send it to ink@navalaction.com with a brief description on what mission and after what (if its clear) it happened, if you haven't do so yet.