Solution:

Make the datablock's poll rate faster than your scan time. For example, if you have a database block with a 5-second scan time, set the poll rate of the datablock it accesses to 2 or 3 seconds. Keep in mind that if you set datablock poll rates to values that are faster than needed, you impose unnecessary stress on your system. Zero Poll Rate You can set the poll rate to zero; this setting forces the driver to run at its maximum rate and disables overruns. In general, you should set the poll rate equal to 0 if it is more important to run the driver at its maximum speed than detect overruns.