Samsung Freezer frost developing

Samsung bottom freezer draw is frosting over now for about 2 weeks. getting heavier in frost.
two model numbers on nameplate RF266AERS & RF266AERS/XAA.

need help to solve the frost problem.

anyone? thoughts?

well with no luck on answers.
I pulled the inside back wall off and puled the defrost element out.
check for continuity. there was none. bought the part off here. installed and works like a charm.
no frost.