Q：I bought a T20 mini Pro a couple of days ago, and now the screen is jumping around randomly. When I press the back button, it responds in other places, and even when I don't do anything, it starts typing on the software keyboard.
A：1. Restart the tablet or restore factory settings to see if it returns to normal (to rule out software issues). If not, proceed to the next step.
2. In Settings, enable Developer Options and check for discrepancies between touch points and response points, and whether the tablet automatically inputs text with a touch effect. To enable Developer Options: About Tablet — Build Number — Tap 7 times consecutively to enter Developer Mode — Return to "System" — Developer Options — Enable Tap Feedback — Enable Pointer Position — Slide your finger across the screen to see if there are recorded traces. If there are traces, record a video to see where the touch is effective.
3. If the target touch location and the actual touch point trajectory are inconsistent, it indicates finger touch offset. Please operate the touch point accurately (this issue often occurs on the Smini, as the screen is too small and not suitable for people with large fingers).
4. If the target touch location and the actual touch point trajectory coincide, but the response position is offset, it indicates TP (touchscreen) hopping. Please replace the touchscreen.
5. If there is no touch on the screen, but the screen jumps erratically, after ruling out software issues, directly determine it as TP hopping. Please replace the touchscreen.
