When saying cuts out @Bonkerz11, i assume you mean that it turns off and nothing will get it going again? Or do you mean that it doesn't respond to your commands but still counts steps?
Have you tried a two button restart yet? Hold the left (back) and the lower right (select) button for 12 seconds, or until the Blaze vibrates and reboots.. If after 20 seconds nothing happens, it is truly locked up. I would do your restart in the chaeger.
Once it is running correctly, swipe over to the settings - tap the screen - scroll to the bottom to shutdown - tap and confirm.. Leave it off for 30 seconds, then press any button to turn the Blaze on.. If it fails to turn on then reach out to fitbit, if it has turned on you have just reset all hardware and software, it is possible that the unit is working correctly now.
For customer service
http://help.fitbit.com/?cu=1 this link is also found under help in the app.