Hi, I'm Sudipto. Welcome to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP
This is a very common problem with this model, the problem is caused due to defective battery or motherboard, if the device is still under warranty period then, get it replaced from Lenovo otherwise you have to repair the device. But, before that follow the steps below at home. Let me know, if you need any further help otherwise please remember to give a positive rating, as that is the only way I am compensated for my time and effort.
Plug in the power
Using a straightened paper clip, insert it into the hole on the bottom edge of the tablet to the left of the docking port until you feel it click
hold for 20 seconds
Unplug the power cable
Insert clip again and hold for 20 seconds
Plug power back in
Press top power button
Is it still under warranty ? because the next steps I will give you can void the warranty.
Sorry for the late reply, please let me know when you are free to continue.