Frigidaire upright freezer-Model # LFFH2067DW. twice in last two weeks, alalrm has gone off, temp around 30 inside unit. Small spots of water on floor below front door. First time unit reset and in 4 hours temps down to 0-10 degrees. This time 8 hours past and temp down to 22 degrees. Door locked-Door not left ajar

I discovered that the drain plug had frozen over ( because of a piece of paper that stopped the drain entrance) and that ice had built-up in the bottom return causing no air flow and temp rising.
I fixed the problem. Theromastat and timer are find. I discovered that the drain plug had frozen over ( because of a piece of paper that stopped the drain entrance) and that ice had built-up in the bottom return causing no air flow and temp rising. I fixed the problem. Theromastat and timer are find.