Do you see any errors in any of the logs (srcds logs or sourcemod logs in addons/sourcemod/logs) that might hint to what causes the crash? Also, what OS is this? Do you have the newest srcds? My srcds reports this when I type version in rcon (Windows):
12:40
1 version
12:40
1 Protocol version 7
Exe version 1.0.0.34 (cstrike)
Exe build: 14
8:01 Jun 25 2007 (3152)