The school where I teach online selects Quiz questions from a pool or questions randomly for each occurence and use of the quiz. So when students get cut off or timed out, I give them the choice of accepting their grade from partially complete work or a reset. I do NOT reset if they have just used up the alloted time with no technical error. If the student says it was a technical error, it goes to tech support to determine IF there was a technical error or if they just timed out.