Hi,
Check that the [https://www.searspartsdirect.com/product/32p3ybot6h-0046-253/id-5304421067|freezer thermostat], [https://www.searspartsdirect.com/model/64k0e9tu9r-001428/frigidaire-frs26rlecs4-side-by-side-refrigerator-parts|part #21A Controls diagram] is OK.
Here’s an image of the wiring diagram that may help.
[image|2397858]
(click on image to enlarge for better viewing)
If the temperature in both the refrigerator and freezer compartments get to the correct temperature then it is normal for the compressor to be turned off. What should happen is that when the temperature rises in either compartment above a minimum pre-set temperature, due to normal activity e.g. doors opening a lot etc, then the compressor should be restarted. It is the thermostats that signal the temperatures to the controls.