UnifiedGenotyper gets lock error

We've used GATK(v2.1-8) in a SGE environment for more than 1 years now. Without any changing in environment, we have had a few cases of UnifiedGenotyper getting hung up while trying to read our previously created .fai and .dict reference files. FSLockWithShared - WARNING: Unable to lock file xxx/ucsc.hg19.dict; ReferenceDataSource - Unable to create a lock on dictionary file.
Then GATK was updated to 2.7-4 and 3.1-1. There was still an error. "ERROR MESSAGE: Timeout of 30000 milliseconds was reached while trying to acquire a lock on file xxx/dbsnp_135.hg19.vcf.idx. Since the GATK uses non-blocking lock acquisition calls that are not supposed to wait, this implies a problem with the file locking support in your operating system."
Besides, there is no problem reported when we run the UnifiedGenotyper step on data store node. This problem happens if we run the UnifiedGenotyper step on compute nodes. We used NFS for shared data between nodes. Is it the way, one is access the data directly and the other one is by NFS shared, leading this problem? If so, how can I fix this problem?
Hoping someone can answer this problem as soon as possible. Thank you!

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