That is totally unacceptable. You should certainly not accept that kind of shabby service. If you can afford to be without it for a week or so (and the way it's running, it sounds like you can), bring it to the service provider and tell them to run extended tests on it. If you don't get satisfaction, either attempt to get your money back, bring it to another provider or call 800-SOS-APPL and give the Apple reps your story. Eventually they will tell you to get it ready to ship to them. Don't give up until you get satisfaction.