Support keeps telling me that errors with the recording of student submissions in Quizzes are caused by students opening a quiz in multiple tabs/windows at the same time. If this is the case, then I would like to recommend that a warning appear when a student with a currently open attempt of a quiz goes to open the quiz in another tab/window. Another option would be to have the warning appear as a warning message when the student goes to submit. In fact, having both messages would probably be the best user experience. As updates are not being done to the Quiz tool, I would recommend this update to New Quizzes to **bleep** this problem in the bud before students start reporting loss of their assessment work.
Added to Theme
Provide students with useful quiz information at quiz time Theme Status: Identified