Hi, I had the same problem before. I had to use a lot of force to press the power and volume buttons, and sometimes it felt like the phone might break. It was really frustrating.
Later, I took the phone to a service center, and they told me that the switch inside had somehow moved out of place. They fixed it, and it only cost about $2 to repair the buttons.
Since you asked this question several months ago, I hope the problem has already been resolved. If not, you might want to visit a service center.
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