Camaleon -- I've set it so that the screen saver and screen sleep are disabled. However, I note that since this problem occurs rather infrequently, it will take more than a day to see whether this helps! Anyway, I can leave it like this for as long as needed to convince myself that this is (or is not) related to the problem.
I'll open a report today or tomorrow on this item. Thanks again for all your help! -PT
