fridge gets too cold, freezer too warm
Common recommendations seem to be &quot;make sure the thermostat isn't set to coldest&quot; then &quot;replace the thermostat&quot; &quot;replace the thermostat control board&quot; &quot;replace the main board&quot;
In my case I don't have any control boards, that I know of.
I replaced the thermostat with a used one, same issue.  Replaced it with a &quot;like new&quot; one and the problem went away.
All 3 thermostat stills &quot;tested fine&quot; (it clicked on and off if frozen or heated).
Theory: the thermostat was &quot;going out&quot; so it would basically over cool, then wait too long before beginning to cool again.  Too wide of a range, as it were.  So the freezer would all melt before it would kick in again.  Then it would overcool again...