Okay, this one will be harder for me to reproduce and it'll be helpful to have your error log. When the game crashes, it should dump a bunch of info here:
[your user folder on windows]/masteroid/error.log
The error log is just a text file with an info dump about the crash. If you can email me that it'll help me fix the bug quickly. You could also paste the file here but it may have machine or user info you don't want to post here. My email address is justin at justindjohnson dot com.
These are the first major stability problems that have been reported. I made some big changes in December to the core math functions in the game. When a fleet attacks a whole bunch of math happens for targeting and wingman flight paths and it's probably hitting some broken state that I failed to test.
Thanks again for playing and reporting bugs.