I read this on a Best Buy review on how to fix the freezing issue - maybe it might help someone?
"I have this phone for a week now,from the moment I received it was freezing all the time ,I was going to returned but boost mobil rep advise me to call samsung ,they instruct me to reset the phone by pressing the volume up and the power key (both keys press down at the same time until the Samsumg name flash twice ,at that moment you will get a menu with 4 options ,you select options by using volume down botton and select it by using the cam botton,first you need to use the delete all (remove micro SD before doing that to make sure you don't loose your data),all data including contacts and app installed will be delete,then after data is deleted choose reinstall android ,at that point the phone will restart (takes around 1-2 minutes) and the phone will be reset to default factory keeping the boost mobil activation , this process fixed the freezing for my phone but note this is not a multitasking phone maybe because has a single core cpu and will freeze from time to time if you try to run application with other apps running ,.."
"I have this phone for a week now,from the moment I received it was freezing all the time ,I was going to returned but boost mobil rep advise me to call samsung ,they instruct me to reset the phone by pressing the volume up and the power key (both keys press down at the same time until the Samsumg name flash twice ,at that moment you will get a menu with 4 options ,you select options by using volume down botton and select it by using the cam botton,first you need to use the delete all (remove micro SD before doing that to make sure you don't loose your data),all data including contacts and app installed will be delete,then after data is deleted choose reinstall android ,at that point the phone will restart (takes around 1-2 minutes) and the phone will be reset to default factory keeping the boost mobil activation , this process fixed the freezing for my phone but note this is not a multitasking phone maybe because has a single core cpu and will freeze from time to time if you try to run application with other apps running ,.."