Whirlpool upright freezer WZF34X20DW stopped cooling, then started, then stopped

Freezer is from 2020 and worked fine for years but suddenly I went in recently and everything was softer but not melted, and the lights worked. I got back the next day and clearly its not freezing. I crank the power dial from 5 to 7 (max) and hear the motor rev up and think ok great. Come back and it froze stuff. About 2 days later though I check and it’s not freezing again. I empty the freezer to prevent spoilage, and then come back the next day and it is freezing again! Of course I dont move stuff in yet, but the next day the freezer is clearly not freezing once again. Odd…

What diagnostic should I look at for this sudden problem?..

Thanks for reading!

Based on the erratic behavior, it sounds like the main control has an issue. Are there two numbers at the end of the model when looking at the model tag?