My Lenovo tablet keeps shutting down by itself.

Hello,

If your tablet turns off, it could be due to several reasons:

Are you using the provided charger to charge your tablet? If so, check the condition of the cord and the plug ends.

Next, check the battery. Is your battery charged to 100%?

Also, check the screensaver and/or battery saver settings.

If after all these checks it still turns off, try resetting it to factory settings.

However, be sure to back up your data/contacts, etc. that you need before resetting the tablet to factory settings.