Could the dropdowns refresh method be the culprit? Is the dropdown associated with a SQL Table?

>I have something weird going on and can't figure out what's happening.
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>I have forms that are connected to a view to SQL Server, these forms have all types of controls on them, including a Drop Down Box.
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>Once in a while the drop down box gets disabled, but none of the other controls, and only when the drop down is setup as a Drop Down Combo, but never as a Drop Down List.
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>I can't seem to see a patern, but I'm sure there is one. The view does occasionally have no records, and then is requeried and new records are added, but why would the behavior be different between a Combo/List?
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>Any help would be really appreciated.
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>Bob