Dell logo flashing once before booting

Hi, I have a dell Inspiron 15 3558 laptop and I have noticed that upon pressing the power button to switch on my laptop, at first the dell logo appears after a second the logo disapears and after another second the dell logo comes back and then the spinner icon at the bottom shows up. After that windows(I have installed windows 10) starts up normally.

               This has started to happen from a few days ago and until now I haven't found any solution for it. Why is this happening and how to fix this?