Hi @arnbrhm ,
As you say it may be a problem somewhere in the sealed system, which also includes the compressor.
According to the [https://www.searspartsdirect.com/manual/1h8onv9qu6-000583|user manual](scroll to p.3), there is a 5 year parts only warranty on the sealed system and a 10 year parts only warranty on the linear compressor.
I would go down the warranty route, especially if it is the compressor. Don’t know if [https://www.channelnews.com.au/class-action-launched-over-lg-fridge-compressor-failures/|this] is relevant to LG compressors in Kenmore refrigerators, but it makes you wonder.