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Despite your worries I tried putting one A4988 instead of the DRV (tried Z and X axis) and it didn't help. Exactly the same thing was happening as before.
So I'm starting to fear that arduino or RAMPS is faulty...
I have no problem ordering another one, but I'd like to test which one is faulty. Well, I don't think that the software is wrong, or all 6 motors are the problem. But I might take a look at the software once more, deeply.