multiple useres creating and updating list same time causes error

Hi

I am using sharepoint 2010.

We ahve created one webpart which contains some dropdowns and button.

On click on button we are creating the list based on selected dropwdown, assigning permissions and inserting data in that list.

This functionality using multiple users at the same time which causing errors like ,

its showing error "list already exists' - but in actual list didnt gets created in the portal.

its showing error "thred aborted"

I think I am getting these errors because of multiple uers creating lists on site at the same time with the same webpart.

Is it ?

if yes then how we could solve this type of issue?

please suggest any solution.