Scores turn to 0

So, after two years of owning my G80 I am again having problems with saving scores. Quite Frankly I think it is a disgrace. I played today and saved my round, go in to look at it and I scored 0, not a single holes score is showing and all my playing partners scores have disappeared, I saved my shots, drives etc and they still show, but not my scores. This cost me £450 and it cannot do the most basic thing I ask of it. I cannot return it now, Garmin should be ashmaed that people are having problems like this without ever sorting it out