BB Torch :: 9810 Clock Losing Time

my girlfriend recently purchased the torch 9810 and the clock on it keeps changing by itself. Mystery to me why but we've played with and changed all the clock settings including putting it onto manual time, auto on our time zone, entering the time itself, etc. but the stupid thing insists on changing the time by itself. This is one of a few problems we've had so far and our confidence is starting to drain in the blackberry phones.if only she'd of listened to me and had an iPhone.