On and Off freezer

Freezer was not restarting after defrost cycle. I replaced defrost timer. Things were better but now the unit works fine for several days and then will stop and everything will thaw. I can turn thermostat down and back up and compressor will start. Sometimes I can just slam the door and it will start up? Any ideas?

http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=ed25tqxew00

See the attachment for the wiring diagram.

Sounds like the main thermostat needs replacing.

I would check that the connections to the thermostat are OK first.
Since the defrost timer and thermostat are in the same module perhaps you loosened a connector when you installed the timer,

All was tight. I am able to manually operate thermostat. Still running sporadically