Careful. Look at the charger, and you'll see that the third pin that is foldable is nothing but a dummy plastic. That pin is supposed to be the grounding pin, and in some old or improperly installed wall outlets, without the grounding pin, leaking current that is supposed to travel back through the grounding pin will turn your device into a live wire electrical conducting device. This is apparent on Macs which are made of aluminum, which why users tend to get these tiny electrical shocks when touching the aluminum body.
The Note however is made of plastic,therefore less conductive. Even so, electricity will travel through the easiest route, which in turn, from the microUSB point plugged into the Note, the closest metal conducting surface will be the lower part of the screen, hence the haywiring screen/touch capability.
Part of the reason why it is desirable to get a three pin plug charger in the first place, but also need to make sure the third pin earths/grounds the device it's charging too. In these modern days, companies that sells electronics assumes that proper grounding of power outlet at their potential customer's homes are done based on a first world standards, unfortunately Malaysia isn't. Only houses specifically builds and asks for these groundings to be built will have them, and therefore will not exhibit these current leakages. It is made worse if you are using extensions, or extending wall outlets from a single old outlet build 10-20 years ago.
My advice is to pick an outlet that is not shared(extension cord), and see if the touch screen still exhibit such flaws. Keep moving to one that will allow your touch screen to work properly and stay charging it at that outlet ONLY.
Thanks for your advice. I didn't know the important of metal earth pin looking at most of the charger now replaced with plastic pin. I thought everything is approved by SIRIM
Besides taking care of your device with SP &cases, i think more importantly the basics wiring setup at home is vital for security and safety of your devices. Any electric spark will eventually cause fires and that is tragedy...