Please follow steps below for troubleshooting：
- Turn on Wi-Fi function in Settings first and select a Wi-Fi from the available list
- Check if the password is correct
- Access Safe Mode by long pressing power key > tapping and holding Power Off > tapping OK
If your tablet works well in Safe Mode, there may be some 3rd apps that cause malfunction
Please reboot your tablet and check again if it works well
- Backup your data and perform factory data reset
