Acrobat constantly freezing

Hi,

I have multiple users currently on Adobe Acrobat Standard v. 11 that have their Adobe's freeze up every couple of weeks. The fix is to run a repair but only solves the issue until the next time Acrobat freezes. This occurs when a user opens a PDF making them unable to print, edit or do anything. In order to close out of the frozen session they need to kill Acrobat via the task manager. Anyone ever have any issues similar or find a fix?