Scroll browser locked

Sometimes when I am running tests the scroll browser(internet explorer) gets locked and it is not possible to move the page. 

- When this happens the test stops with errors preventing the test from continuing to perform the following actions. 
- If I minimize and maximize the page the scroll unlocks. 
- When I perform the same actions manually there is no problem with browser scrolling. 

I tried with various tests and different versions of internet explorer. Client web application only works on IE 

Have any idea what it might be?