Live Viewer stops showing images after running for awhile

I leave the LIve Viewer open on the BI machine and after awhile, it stops showing images. It still seems to be updating data, but not most of the images. If I click F5 (refresh) it forces me back to the login screen. So it may be related to that ongoing issue. Once I login and go back to the screen, it is good again for several hours but inevitably returns.