Why is my Phone struck in S-View mode without using S-View Cover?

My phone is 2 yr old Samsung Galaxy S4

It started going into S-View mode intermittently even though I was not using S-View cover.

Now it has struck in the S-View screen. Whole screen is black with a Clock and call notifications. I am not able to access anything else

I have done Hard reset to wipe out all the data and restart the phone. It didn't work

I have also removed a metal Screw near L1 as suggested in another forum (This worked for a while), but again its reverted back to S-View mode.

Kindly suggest me a fix to this problem.

Thank You