Talking Aluminium foil trick seems to work here (for now...)

OMG!
I had given up already but I tried the aluminum foil trick and it seems to work here!!

Those who want to try:
  • cut out a small strip of alu foil (about 3 x 1 cm)
  • fold it (you now have 1,5 x 1 cm)
  • place it on the inside of your back cover. About halfway, on the right outerside there is a contact
  • make sure it sticks out about 1 mm
  • place your phone in the back cover
  • check Touch Test app for the results

On my phone, this was the only thing that worked. Improvement is 90% here. Let's hope it stays this way.
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