Every time you turn away from a door, the sound cuts off whether it's a door or a piston door and when you push a button/pressure plate the sound cuts off when you turn away!
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Your Java version is way out of date. Please update your Java to the latest version: http://www.java.com/en/download/ . Keep in mind that when using a 32-bit browser on a 64-bit OS the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp .
Try following this Tutorial to update LWJGL: http://www.minecraftwiki.net/wiki/LWJGL
I updated it and it still does the cut off thing like when i go through a piston door, it will make the pressure plate sound then when the piston door closes when i don't look back, it doesn't make the sound!
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.