How to prevent ice from building up - Kenmore Freezers

Check for a clogged drain line. Snake out and get some vinegar in there. Any water collecting from the defrost cycle is supposed to be led away and outside from the unit

there should be a drain hole at the bottom of the freezer that goes to a evaporation pan underneath. check to see if the drain is clogged. in areas with high temps and or humidity there will be excessive moisture build up,the more the door is opened the more moisture (condensation). Clear the drain, it may just be blocked by ice, MAKE SURE THE UNIT IS LEVEL! This will let the moisture drain properly and prevent ice build up.

You might have ice building up on your evaporator coil. That ice serves as an insulator and prevents the internal freezer temps from going down to design parameters. The ice buildup is caused by the defrost mechanism not working - check the timer or the defrost heating element.

door has to seal tight. also, there are door frame heaters called, "Anti Sweat Heaters." It is to prevent condensation and ice build up around the doors. Have that checked out.

Freezers should defrost as perscribe to prevent build up of ice.However it would not be long enough to cause listed problem.
If things are defrosting as stated, there is a problem other then the defrost

You should to check the Whirlpool Gladiator Freezerator's door sealer to make sure all rubber or plastic seal very well to prevent air humidity come in to build up frost fast. Also, you have to defrost completely and wipe with cloth or paper towel to absorb all waters out and let it dry completely to prevent frost build up.

There is normally a small filiament of metal which is attached to the defrost element and conducts heat down the drainpipe preventing ice build up. You can pour some boiling water onto this area and even wriggle a piece of plastic tubing down the drain pipe to dislodge any blockage. For future prevention, you can attach a piece of copper wire around the defrost element (in the absence of the original filiament) and extend it down the drainpiple

Not much you can do except ensure you have a tight seal and not to open it more than you have to.

There is a defroster built into the ice maker to melt the ice a little around the edges before dispensing on most ice makers it may need replacing.