How to fix Nokia Lumia 520 frequent shutting down issue

My Nokia Lumia 520 frequently shutdown recent days.  It happens more when I press the screen or hold it on the hand.  Today, I found the answer from https://answers.microsoft.com/en-us/winphone/forum/wp8-wpupdate/my-nokia-lumia-520-is-frequently-shutting-down-for/c08b930e-ce27-490e-9881-c2406e2b7332

Simon-PierreChevarie-Cossette replied on

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The problem is with the battery connectors. You have to bend slightly the connectors to the middle so that the battery is held right. I did it a week ago and everything is right! My phone used to close up to 15 times a day but it doesn't anymore.

Thank you Simon.

Qingsong