I think returning it may be a good idea. The noises you hear when you turn the unit off may be normal. It should sound like static between two sheets when you remove them from the dryer. Part of this is the auto deguass circuit I mentioned. Sometimes a snap like you mentioned is caused by a particle of dust. Ocassionally
this may only happen once. If the tube is still showing a color bleed, I would return it as it is most likely that the problem will show up again. Good luck!