It started with 4 trains that were serviced by SPS Mieczkowski and just wouldn't start. The company was forced to pay €0.5m in penalties and trains were sent back to Newag. At the same time several other trains from different companies that didn't even got to service but spent a bit too much time in one place became immobilized. This all led to SPS Mieczkowski hiring Dragon Sector to investigate and they found several separate routines to disable trains.
This case is investigated by Central Anti-Corruption Bureau in Poland but I doubt it'll do much harm to Newag. The Office of Rail Transport of Poland that would spam rail company with complaints and orders for a small mistake in train schedule washed it's hands from intervening in this case and train purchases have highly regulated tender process and very little wiggle room for rail companies.