Why is my phone randomly flashing a red light?

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AC Question

Why is my phone randomly flashing red light

I've recently noticed that my HTC desire 816 sometimes flashes red led light once or twice. I don't see a pattern, it happens randomly and I barely notice it with the corner of my eye. (Mostly happens when I put it away) my battery level is normal. Last night I was in the dark so I turned my screen of (I was going to sleep) and I noticed the light. No new notifications. Nothing.
what could be causing this and of course, how can I fix this?
Thanks