If this is occurring on the 'distribution' piece of the task only, you can change the following setting in the QDS exe.config:
OpenDocumentAttempts- This setting determines the number of attempts by the QlikView Batch (QVB) process to open the QlikView file before it is logged as an error during the distribution cycle of a task. In environments where there may be some file system latency, and the Disribution Service Root_date logs show entries regarding 'could not open file', increasing the default value to a few retries may alleviate the task failures. Default value is "1".
Actual setting in QDS file:
<!-- The number of attempts the document is tried to be opened before it's logged as error during distribution --> <add key="OpenDocumentAttempts" value="1"></add>
Try bumping that up to see if that alleviates the ultimate failure, it may just be that the file system is not ready for it to be accessed again so quickly after the reload completes etc...
If the issue is occurring in the reload section though, this will NOT help, need to find out if the file is in use by another process, Process Monitor from Sys Internals tools is the best way to do that... If you have not had Anti-Virus excluded from your QDS Source Documents etc., that could be another thing potentially causing the issue as well.
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