Lenovo TAB A8 problem

Apr 16, 2018
There are some strange things happening with my A8.
1. The bar at the bottom of the screen doesn't hide when I swipe down.
2. I can't swipe down to reveal the bar where there notifications, time, and battery are.
3. I can't rotate my screen, even though I have the Auto-rotate feature on.
4. Because of 1, I can't Hard-Reset via Settings.
5. When apps load, the screen turns black before the app loads, instead of a regular transition.
6. The power button is jammed, so I can't turn off my screen.

Please suggest ways to fix these problems.