Freezer is running constantly. ice crystals formed on outside of packaged foods. food is still frozen.

The door was left open,if you find frozen water droplets on the food packages or ice crystals it forms from the warm air coming in,make sure all the packages are pushed in and not hitting the door and you can tilt the fridge back a little so the door will close with a slight push.also check the ice shout door and make sure no air is leaking through it,you'll know you'll see all ice around it.you can check the condenser coil and condenser fan to see if it needs to be vacuumed,the machine will run longer if the coil is clogged with dust or if the fan isn't blowing,the coil should be cleaned every 6 to 12 months.hope this helps but it sounds like the freezer door was left open.