fwiw, i have had this problem twice, although only early on (ie: pre 3000 miles). 5000 miles since then i've never had the problem. both times the date and time got whacked and had to be reset.
i periodically see it be slow to populate the date/time onto the screen, but i think that's just 'cuz the software is so horrible. all sorts of slow stuff on that screen.
my two pennies,
shawn