"If needed I can share the code with you." Yes, some code is needed, but probably not your entire script. Rather, edit the script down to a minimum sample that creates (demonstrates) the same problem. "Show us the code" is the best advice at the moment; as ratazong says, we can't offer much more than vague generalities without code and some sample data.

Also note that descriptions like "very quickly," "for some more time," and "stops at some point" are only vague generalities and thus not all that helpful in our efforts to help you. After all, is "very quickly" on the order of microseconds or days?