I have a Woods (ya shoulda bought American) chest freezer 7cu,ft. 5 1/2 yrs. old. It will cool to the propper temp and shut off but it won`t come back on unless I unplug it. Then it does the same thing. I`ve been told it`s the thermastat but I can`t seem to get one. Can I replace it with some other Brand that I can get and if so what are the requirments. Stubs