It's normal for any game's online population to diminish with time. There's also a heckva lot more new games out (GTA4, Ninja Gaiden II, etc.) there (in addition to summer weather) that will keep people offline.
For people who are still having trouble, we can't operate in a vacuum with no detailed info. Please zip up your minidump file, a dxdiag report for your PC, your save games that fail, and a description of the issue (with as many details as possible) and send it to support(at)ironcladgames(dot)com.
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