My phone crashes when its locked?

I don't know if this matter but i droppymy iphone 5c at a low height yesterday, no cracks except there's a rattling sound inside like a loose screw. And recently after that incident everytime i would like my phone and wait 10seconds, it crashes. I press unlock and nothing happens. Home button, nothing happens. I reboot the phone and the same thing happens. So far what's working is putting on the never autolock setting.

Sounds like need to take phone into cell phone repair place cause something is loose or disconnected n needs fixed

Change your battery.

Dropped once or dropped several times before and this time something broke loose inside?

One drop from a "low height", does not knock things loose.

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