Are you running apps that could heavily delay your alarm? There are apps that could slow down your phone enough to be unresponsive to things you set it to do. This could not be your phone's problem but more of a possible culprit app. Check which apps are running and using high RAM while your phone is idle. Apps could include facebook and snapchat. If this does not work see if there is a update for the phone itself as there could be a software issue with missing files or packets that could be fixed with an update. If all fails just download a free alarm app or (unrecommened) factory reset your device. If your phone is under warrenty, call BLU support and do not email them to see if they have a solution to your issue.