Ticking and whirling sound on Aspire Plato

Hi. Just vaping on a quiet night of my front porch and I accidentally put the device next to my ear when I heard a faint ticking and whirling sound while the device is on. It seem to dissapear when the screen goes off or when its on lock mode. Has anyone ever notice this or is my device the only one that ticks? Should i be concerned?
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