Power button only works sometimes

I have the Lenovo Yoga Tab 3 8, and for the last few weeks the power button has become unresponsive. I now need to press down 7-8 times before achieving the desired result of powering the screen on or off. I have found that the magnetic sensor on the edge that tells the tablet if the case is open or close still works to power on the screen.

Is there any way to fix this situation.

Thank you