i started a survival world, ibe only played around 5 minutes when ii had the following Game Crash:
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release
i had it like two times and i dont have idea what it is.
Please attach the complete crash report. What you are mentioning is very likely not the reason for the crash.