A PC won't crash because your network connection is too slow.
A PC only crashes because you have a hardware or software issue that needs to be fixed.
1. the error, and
2. the GAME that is crashing.
3. Your connection UPLOAD and DOWNLOAD SPEEDShttp://www.speedtest.net/
*Do you have problems running OTHER GAMES that use the network.
**By "crashing" if you are playing an online service that STREAMS the game too you (i.e. ONLIVE) and it just kicks you out of the game then your problem is simply a network connection that is too slow. There is little you can do about that.