Glhs65ehsb4 frigidaire refrigerator the compressor does not come back on when the fridge goes into defrost mode

SOURCE: frigidare side by side

you have a bad compressor

SOURCE: frigidaire defrost problems

if the heater and thermostat are good and wired correctly then the only other thing would be the defrost timer board.

SOURCE: Frigidaire frs24zrh refrigerator not cool enough

Check out partselect.com. need to replace defrost timer and defrost thermostat. good luck.

SOURCE: Problems with Frigidaire Refrigerator not cooling

In turning it off you may have only closed the air damper. Set it to 1/2 way.
If ice or frost in the air damper area on refrigerator side you may not be defrosting the freezer coil.

Inspect from bottom looking up with a mirror and flashlight. You should have no Ice buildup frost that is even and white is normal. Feel Check the back wall mid way down to 1/4 way to bottom. Push on the wall slightly. Crunching like frost or snow behind wall is not normal. I suspect non defrosting here.
Next eliminate the inside fan motor. It has to run to push air all over the freezer and refrigerator. If this fan doesn't run the results will be only the area with the refrigeration evaporator coil will cool and it may get too cold and resemble a non defrosting situation where the air is not able to circulate because of frost build up.

Next eliminate the Ice maker and light as a source of heat. Unscrew and unplug them
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Next eliminate the door gaskets from not sealing. A piece of paper set tween the door and frame and pulled across it and you feel resistance all the way and the gaskets are smooth and not warped they are OK

Next inspect the condenser fan and coil by the compressor underneath. A dirty coil here will cause diminished heat removal and possible for a partial cooling of some of the freezer.

Only after inspecting all these items and determining they are OK should you proceed with refrigerant checking. Also a person with out the ability to measure the actual amount of refrigerant being put in should be shown the door. Even with topping off (adding some) refrigerant I use a scale to determine that I do not put in too much. So if you have a friend that does this and no way to tell how much is too much.... well with all due respect your getting what you pay for.

If this helps you understand your problem and need more information please post back, I will follow up. If it helped you determine your trouble please rate me as high as you can. Thank You for using fixya and good luck.
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SOURCE: my frigidaire refrigerator keeps defrosting on the freezer side

sounds like a bad defrost timer
or depending on the model a bad
electronic or adaptive defrost board