13 year old amana (model #rb2214 cb) a few months ago would not keep things cool, started clicking sound. We shut it down and cleaned coils under frig. After a few hours later plugged it in and it started and ran for about a week. Then same deal, started clicking, wouldn't keep things cool, but after a few hours it ran again. It has run successfully for a day now, but we cannot trust it. Should I get rid of it?