kkazakov:
I really don't have such floating inputs, at least none I can tell of. How I can check them? Everything looks connected, I tested with multimeter and everything is connected ...
Then test some more. Your problem is one of floating inputs period.
Just because you haven't found it yet does not mean you haven't got them.
Do not use a resistance meter on a powered circuit. Also it is not much use on an unpowered one most of the time.
Measure voltages both on the wires and on the pins of the device.