Informatica7.1:HIER_28004 XML Reader Error:Could not retrieve a block from the DTM

We use to load almost 2-3 millions data from XML per day.Nowadays we were getting a strange kind of error as in the title.
We have our mechanism which can remove the error HIER_28056.But that mecanism can not solve this error.So many files were failing.I identified that it was happening due to smaller buffer size.I increasec the DTM size and its solved.

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