After running a few hours, the LG dehumidifier 3850A20500H begins to vibrate and makes a considerable amount of noise. After shutting down a few minutes and restarting, the vibration and noise ceases, but again starts to vibrate and become noisy. The unit does not create excessive heat, but LG has had recalls due to fire hazards on its dehumidifiers in the past. Should I be concerned? Thank you...