Internet Explorer is becoming non-responsive

I have a very similar issue. We are running our tests in IE11 using TC 11.20 on virtual machines. After about 1 hour into the test run there are a particular set of controls that stop responding.

I fixed the issue by writing a small script that logs out of our application, kills all IE processes, then restarts browser and logs in. This script runs about every ten tests in our test run (approximately every 30 minutes). 

I suspect this is a memory leak issue in IE and or Test Execute but would require some more in depth troubleshooting. I did try running IE developer tools 'Memory' feature to watch memory usage while tests were running in real time and it does climb contunously during my test run and fairly high. I would assume to the point where my application eventually becomes non responsive. 

I also came accross someone reporting a similar issue with Selenium tests (after a Google search for issue) and they resolved by restarting the browser perididocially so I suspect this may not be an issue exclusive to Test Complete. 

I have a ticket open with SmartBear but no response yet, perhaps you can also open a ticket if you havent done so already?