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System dump do happen when there some jerk making other's have a system dump in DF2 land i seen 15player at one time left only to come back and say they had a system dump and a fool cheater said he did it. so there are some who are making it so.
Normal a system dump: only happen when there something is bad a file or a map.
Not normal: when some one finds a way to upload fake system dump to other's thier game believe it had a system dump. best way change the file to read only in properties of the system dump it block it from being change or updated.
best way to tell watch your firewall have it set to highist settings when playing DF2, its loaded with hackers and cheaters in them Nova-host game areas, play in public and password areas its in these area you will find great players in playing it fair & good sportmenship with others.