[Galaxy Note 10.1 (2014 Edition) Q&A, Help & Troubl] Ettepetje:
[Update March 5th 2014]

Probably all 2014 Note 10.1's sold these past few months are suffering from one or more multitouch issues. From what we now know these appear to be software issues, effecting all current firmware versions for this device.

There are 2 known manifestations of this bug (or more likely: these bugs), described below. In both cases it seems to be a software issue because normally the 2014 Note 10.1 will work fine and the process of re-creating the issues is very clear and repeatable.

It looks like the multitouch driver becomes unstable if either one of the following occurs:

1. (Some models) You place (a part of) your hand on the screen for (at least) 5 seconds without moving it. This would usually happen when you are writing or drawing with the S-Pen.

2. (All models?) You place a finger (or several) on the screen for a longer time (close to 30 seconds) without moving it (them).

After either of these situations a 'defective unit' will show very erratic multitouch behaviour for a while.

It is easiest to see what happens if you use a so-called "Multitouch testing tool" (available Free on the Play Store). Such a tool typically shows all the screen areas where screen touches are detected by the device (in this case: the 2014 Note 10.1). Examples of such tools are: MultiTouch Test, MultiTouch Tester and YAMTT.

Erratic behaviour will usually start with all screen touches suddenly disappearing, meaning the device forgets that you have fingers (or part of your hand) on the screen. If you remove fingers (your hand) from the screen and again touch the screen several times a whole range of behaviour is seen: touches are detected and erroneously forgotten in quick succession. Sometimes so-called ghost-touches appear (meaning, the device will detect touches not anywhere close to where you are actually touching the screen).

This erratic behaviour will usually disappear when you leave the screen alone for a while, although several people (including me) have reported longer running issues (for instance during typing and editing using an on-screen keyboard). A surefire way to get rid of the issues is rebooting your device.

Since this is a "Note" device many people who's 2014 Note 10.1 suffers from these multitouch issues will encounter it while (or after!!) using the S-Pen. Others will notice issues while gaming or during typing/ editing.

The following clip by Kizune shows an example of what can happen while being inside a Multitouch testing app: [YOUTUBE]57Kh5biLBOs[/YOUTUBE]

More videos you can find below (in post #16) and in the SwiftKey not working well on 2014 Note 10.1 topic, where the roots for starting this topic sprout from.

As of yet Samsung appears to be unaware of these issues, although several have approached them about this, returned their Note tablet, exchanged it or even handed one in for repairs. Hopefully we get this fixed soon.

Note 1: from early reports (in post #83) it looks like the new Note Pro 12.2 doesn't suffer from these issues.

Note 2: It is possible that a build up of static charge (through capacitance) is causing these issues, possibly caused by bad wiring (grounding) of the touch/ S-Pen detection circuitry.

Note 3: A new video has surfaced (in post #89) which shows 'noise' introduced in the touch-detection software while pinching/ zooming (see video below). It is unclear if this is related to the issues mentioned above.

[YOUTUBE]YuZKn0W9aIo[/YOUTUBE]