Custom Nintex Action Issue

Hi,

I have created a custom nintex action that updates a word document table with data.

The action works well except for a small issue.

Every day, when the workflow that has the custom nintex action runs for the first time, the workflow stops at custom action and the status of WF stays in "In Progress" forever. If I terminate the workflow and restart it, the workflow works fine. This happens only when the workflow is ran the first time of the day.

I tried to find a cause with no LUCK. Any ideas??

Thanks

Chaitanya Malineni