Windows .exe Randomly Crashing in the DW20 Pack and other packs

[Pentatonix]

Operating System and bit type: Windows 8.1
Java version/update and bit type: Java: 7 Build 45. 64 bit OS
Launcher version: v1.3.3
Console log, pastebin.com link: N/A
Description of the Issue: This issue occurs in every pack i play (DW20 1.6.4, Horizons) I load up a new world just fine, exploring the world (You know, usual early game stuff) then about 5 minutes in, i crash. There are no error messages, crash logs, nothing. The whole client just closes, including the console. The whole game is just completely gone. I would have to re-open the FTB launcher and wait 3-5 minutes for the game to open up again, and it just occurs to me again. This is very frustrating and annoying for me and im sure to others if they are having a similar issue. I hope to get this resolved for me and any others if they are having a similar issue.

P.S. I have the RAM set to 3 GBs(i have 8 on my system)

 

[lavarthan]

Open the launcher and in the Options tab there should be an option for 'Reopen launcher exiting minecraft' make sure that is checked. If not then check it and close the launcher then close and restart the launcher and see if it opens up again after the game closes at crash. If this does not work please follow the basic trouble shooting guide carefully and precisely.