That sounds like a seal or moisture issue. Make sure the freezer door is closing properly and the gasket isn’t damaged. Also, try not to leave the door open too long—warm air getting inside can cause excessive frost. If the problem persists, it could be a defrost cycle issue. Astera Services
https://www.asteraservice.com/ offers appliance and HVAC installing and repairing services, so they can inspect your freezer and fix any underlying issues to keep it running efficiently.