Has to be a network issue. Printer only prints what it receives when it receives it. Even though the printq clears is it the printq on the user's computer and if so what about the printq on the server which I am sure you are using. To diagnose the issue just connect one of the users having issues directly to the printer using a local tcp/ip connection and see if the jobs now print all the time at the correct time. If they do then you are having server issues.
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