not able move across elements in QTreeWidget

[sujan.dasmahapatra]

Dear Friends
I have a QTreeWidget in my application.When I am loading some items (QTreeWidgetItem) I can see the items are there. But after some time my mouse is getting stuck and I am not able to move to select a different item.
Any idea from anyone what could be the reason.
I am guessing this could be the performance problem but no clue I am getting about how to resolve it.

Any help or comments would be highly appreciated.

Thanks
sujan

[wysota]

Please provide a minimal compilable example reproducing the problem.