Minecraft oyundan sürekli atma sorunu

Arkadaşlar minecrafta girdikten 2- 3 dk sonra oyundan atıyor. Bu neden kaynaklanıyo olabilir. Önceden böyle bir sorunum yoktu format attıktan sonra böyle oldu.

'Development Console' kısmında bunlar yazıyor.

[21:55:44 INFO]: Client> [21:55:44] [Server thread/INFO]: Umut oyuna katıldı
[21:55:47 INFO]: Client> [21:55:47] [Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2782ms behind, skipping 55 tick(s)
[21:55:56 INFO]: Client> [21:55:56] [Server thread/INFO]: Umut [Envanter Alma] başarımını kazandı
[21:55:56 INFO]: Client> [21:55:56] [Client thread/INFO]: [CHAT] Umut [Envanter Alma] başarımını kazandı
[21:58:09 INFO]: Client> #
[21:58:09 INFO]: Client> # A fatal error has been detected by the Java Runtime Environment:
[21:58:09 INFO]: Client> #
[21:58:09 INFO]: Client> # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x7c901980, pid=3900, tid=636
[21:58:09 INFO]: Client> #
[21:58:09 INFO]: Client> # JRE version: Java(TM) SE Runtime Environment (7.0_67-b01) (build 1.7.0_67-b01)
[21:58:09 INFO]: Client> # Java VM: Java HotSpot(TM) Client VM (24.65-b04 mixed mode, sharing windows-x86 )
[21:58:09 INFO]: Client> # Problematic frame:
[21:58:09 INFO]: Client> # C [ntdll.dll+0x11980]
[21:58:09 INFO]: Client> #
[21:58:09 INFO]: Client> # Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
[21:58:09 INFO]: Client> #
[21:58:09 INFO]: Client> # An error report file with more information is saved as:
[21:58:09 INFO]: Client> # C:\Documents and Settings\Umut\Application Data\.minecraft\hs_err_pid3900.log
[21:58:09 INFO]: Client> #
[21:58:09 INFO]: Client> # If you would like to submit a bug report, please visit:
[21:58:09 INFO]: Client> # HotSpot Virtual Machine Error Reporting Page
[21:58:09 INFO]: Client> # The crash happened outside the Java Virtual Machine in native code.
[21:58:09 INFO]: Client> # See problematic frame for where to report the bug.
[21:58:09 INFO]: Client> #
[21:58:09 INFO]: Client> AL lib: (EE) alc_cleanup: 1 device not closed
[21:58:09 SEVERE]: Game ended with bad state (exit code 1)
[21:58:09 INFO]: Ignoring visibility rule and showing launcher due to a game crash
[21:58:09 INFO]: Deleting C:\Documents and Settings\Umut\Application Data\.minecraft\versions\1.8\1.8-natives-2269091638758
[21:58:09 WARNING]: Couldn't delete C:\Documents and Settings\Umut\Application Data\.minecraft\versions\1.8\1.8-natives-2269091638758 - scheduling for deletion upon exit