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WRF stops running after 3-4 hours

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I am trying to assimilate prepbufr data using 4dvar. The domain resolution is 9km and I want to use an assimilation window of 6 hours.
WRF stops with no errors after around 4 hours of integration. Whereas, if I set the assimilation window to 3 hours, there are no issues and wrfvaroutput is successfully generated. But I need a six hour assimilation window.
I have tried changing the timestep, number of processors, distribution of processors, etc. But nothing is working. There are no cfl errors or segmentation faults either.
Could you please help me resolve this issue?