You plug in a charger and suddenly your phone starts acting haunted: taps register in the wrong place, scrolling stutters, or the screen "ghost touches" by itself. It feels like a software bug, but many times it is a power quality problem.

Touchscreens are sensitive. Cheap or poorly designed chargers can introduce electrical noise (ripple) into the phone’s power input. If the charger’s isolation and filtering are weak, that noise can leak into the touch controller and confuse it. A missing or unstable ground reference can make the problem worse, especially with certain wall outlets and adapters.

A charger can show the right watt number and still have poor regulation. When the charger output voltage is unstable under load, the phone has to fight to keep its internal power rails stable. Some phones tolerate this better than others, which is why the same charger might be fine on one device and chaotic on another.

A thin, long, or damaged cable increases resistance and can create small voltage swings as current changes. That does not just slow charging, it can also worsen electrical noise reaching the phone. If ghost touches appear only with a certain cable, the cable is part of the problem.

When a phone charges, internal components warm up. Some touch controllers become more sensitive to interference when temperature rises, especially if the charger is noisy. This is why the problem can start after a few minutes instead of immediately.

Avoid unbranded ultra-cheap chargers and worn cables. Choose chargers with stable PD/PPS behavior, good isolation, and consistent output under load. A stable charger is not only about speed. It is about clean power.