Hello. See possible reasons below.
- Internal storage is full and coursing the tablet to freeze.
- Touch screen may be some how defected.
- Touch screen may be not connected properly.
- It could be hardware related issued.
- Liquid Damage.
- Soft reset your tablet: Press and hold the power button for 15-20 seconds or until your tablet restarts.
- Reset your tablet to factory default.
- Open the tablet and clean the main board using a methylated spirit
- Replace the touch screen' buy here http://parts.satechhelp.co.za/