The following procedure is a permanent solution to your problem. I have found it to work quite well.
1. Power down device using on/off button on side of unit.
2. With device now off, turn it over and on the back upper corner is a small hole labeled "reset"
3. Using a toothpick or other small poking tool, press reset to button twice while also pressing & holding down the volume up (+) key and the large "home screen " button on the front bottom center of tablet.
4. When nothing happens, stop pressing all previous buttons.
5. While holding device firmly in hand, begin shouting obscenities as you forcefully throw tablet on to a concrete driveway or sidewalk of some kind.
6. If unit fails to break into several pieces, begin stomping on it with your feet until visual permanent damage is obtained. **WARNING: Backup any data you wish to keep before beginning step 6. This step will permanently wipe all data from this device.
7. Finally, go buy yourself a new, more expensive, better quality tablet & quit buying these sub-standard 'knockoff' brands that are nothing but P.O.S.'s.