Hi Ole,
cable length and interference problems may occur, the longer a cable is. But before you throw anything away, try out what the real problem is.
If you say, any key of a row is affected by a single button press, there may be something very misterious.
I suggest you to remove all cables from the interfaces and then connect one after another and look what happens and when the problems begin.
You can add resistors to make the key inputs more insensitively. But before i tell you how, be sure where your problem is. Attach some photos of your cabling.
Good luck
Dirk
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