Older (1994) sears freezer (Kenmore 23) is tripping GFCI. At first upon resetting the GFCI the freezer would work again for a number of hours (sometimes for a couple of days) but now, it trips the GFCI within seconds of resetting the GFCI. There are no signs of water anywhere around/inside of freezer or compressor/electronics; I have tried two other GFCI plugs in the garage with the same result. The garage is heated and doesn't drop lower than 45 degrees. Thoughts?