It's about hardwares.
If dead keys are the same notes(C2-C3-C4 or E2-E3-E5 etc),its electronic parts problem.
If dead keys are random(D1-F1-G3-B5 etc),chances are :
- Rubber keypads is break. Below the keyboard. Replace it.
- Dust can cause bad contact the carbon inside the rubber keypad. Clean it.
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