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I will need to ask about just how it does not work, before giving any opinion: does it fail to show a position? or fail to recognize your course? or what other failure does it display on your home course (or on other courses) ?
Also, how old is the Sureshot device in question?
Please use the Reply To Expert function to let me know, and I will advise you.
Does the whole screen go blank to the edges? or just the map portion of it?
Does the map of the course show at all? even temporarily? or does it just not show at all, except for the blankness, when you select that course?
Does this only happen on some courses, but not on others? it really sounds like a battery power problem, but if it were, you would expect it to fail on each and every course, period.