Back Ups 750 clicking sound every 20 seconds.

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I have noticed that since last night my Back-UPS 750 has been making a clicking noise approximately every 20 seconds. The only thing plugged into it are my high-end PC, dual monitors, and router. I noticed that when I put everything to sleep last night the clicking stopped. Also, I believe it started right as a storm hit my area. Is this just a natural function of the UPS with some sort of relay turning something on and off, or is it something I need to worry about?

Thanks in advance -Michael

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