A few months ago my fiance got us an igloo mini fridge and Initially I noticed some humming, gurgling, and clicking or popping noises. But the clicking sound seems to be getting louder now that sometimes it scares me a bit when I hear it. So Im trying to find out if something is causing this to happen that i can correct myself, or do we need to return it for another one (purchased from Walmart). Any advice would be much appreciated! Thanks!