Best I have is likely you may need to increase the Desktop Memory Heap setting on the QDS server(s) to a higher value. Here is a link to an Article that has an R&D whitepaper attached, so you can review everything, but check the section on QVB engines, if you have not increased the Desktop Heap memory setting in the Windows Registry on the QDS server(s), that is likely the first thing I would try. The symptom would be if you only see the issue when the number of concurrent tasks is pushing the upper limit etc., that would signal I am likely on the right track. That is only thing of which I can think at the moment other than a file system issue, but given it runs fine a bit later, pretty sure it is more likely that QDS server(s) may need some more resources etc. to handle that load. The other option would be to reduce your QVB engines for distribution setting a little to see if that does the trick, as that would then queue the excess tasks etc. instead of trying to run them concurrently.
Scaling QlikView Publisher
Regards,
Brett
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