Quote:
Originally Posted by JIPG-reader
I am very sorry about your issue. To be honest, it seems very strange to be sw related, but in case you do not discover the origin of the problem, it is better to try with previous fw.
Have you feel that you missed some screen touches before the problem occurs (kind of keyboard buffer)?. I have this problem in a tablet when it freezes from time to time. In the kobo, it is not unsual to have to press twice to have the action done. Sometimes, you obtain the action with a long delay.
As a last idea, do you have any new shoes with a very isolating sole?. I have had electrostatic discharges problems in the past due to that. It is very unlikely, but ...
If nothing works, maybe you can ask for a warranty claim. 
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Thank you for your support! My device is quite responsive to my fingers.

I recently got a new pair of shoes, maybe it causes me to hold electrostatic charge and make my Kobo go crazy when I hold it.
I am going to ask for a warranty claim if I could not fix it myself. But I am a little worried about the irreproducibleness of the issue. The technician might not even observe the problem in a quick check.
Quote:
Originally Posted by JSWolf
One thing you've not tried s to change page turns from a tap to a swipe. Maybe that will solve your problem. You can find the option to change from a tap to a swipe in options.
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I tried the swipe mode, it definitely reduces the random page turns; but the issue remains in the settings menu. Also, I really enjoy tapping for page turns instead of swipes.
Quote:
Originally Posted by frostschutz
If you didn't update after the factory reset you mentioned, you already tried it.
Maybe Settings -> Beta -> Sketchpad would help make those touches visible?
With telnet/ssh shell access, you can also use pickel to debug-print touch events.
Might help narrow down the issue...
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I updated after the factory reset. Now I am planning not to do it. Thank you for the tip!
There is no Sketchpad in Settings -> Beta, only web browser and wide mode (unsure about its name in English). Does sketchpad require a patch or something?