It could indeed be those huge memory leaks BC has. When I use highly detailed and big ships, or ships that have pulse weapons etc, this game goes from 40% memory usage to 80% within 10-15 minutes, which is annoying. Then it usually crashes to desktop with "STBC.exe didn't shut down normally" and tries to find out the reason which it can't find, and then i just have to restart the game.. and the bigger the install, the sooner it happens.. :'(