minecraft: Padá mi mc při Lanu

Zdravím , když se na noťasu v minecraftu připojím na lan po nějaké době (4minutky) mi to spadne a vypne se minecraft : vratí mě to na launcher ... development console napíše toto : Client> # A fatal error has been detected by the Java Runtime Environment:
Client> #
Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x000084c1, pid=2044, tid=3640
Client> #
Client> # JRE version: Java(TM) SE Runtime Environment (7.0_45-b18) (build 1.7.0_45-b18)
Client> # Java VM: Java HotSpot(TM) Client VM (24.45-b08 mixed mode windows-x86 )
Client> # Problematic frame:
Client> # C 0x000084c1
Client> #
Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
Client> #
Client> # An error report file with more information is saved as:
Client> # C:\Documents and Settings\Admin\Application Data\.minecraft\hs_err_pid2044.log
Client> #
Client> # If you would like to submit a bug report, please visit:
Client> # http://bugreport.sun.com/bugreport/crash.jsp
Client> # The crash happened outside the Java Virtual Machine in native code.
Client> # See problematic frame for where to report the bug.
Client> #
Client> AL lib: (EE) alc_cleanup: 1 device not closed
Game ended with bad state (exit code 1)
Ignoring visibility rule and showing launcher due to a game crash
Deleting C:\Documents and Settings\Admin\Application Data\.minecraft\versions\1.7.5\1.7.5-natives-4404176911870
.... nevíte co stím ? přitom normální single jde a minecraft nepadá dělá to jen lan nebo server :) díky za radu :)