Cyberpsychosis

Supposedly, cyberpsychosis is a mental condition in which the addition of cybernetics causes an already unstable personality to fragment. As cybernetic enhancements gradually substitute original human body parts and functions, person's empathy deteriorates and they become violent, sociopathic and vicious. As cyberpsychosis takes hold, their mental limits crack, and they turn either into a murderous mechanized psychopath multiplying violence and mayhem, or cave in to sadism, split personality, extreme mood swings, and paranoia.
At the same time, there is no solid science to back up the existence of cyberpsychosis. Sure, deteriorating mental health reached the scale of a social issue, but this is more easily explained by increasing violence and uncertainty of the world overall, rather than cybernetics alone. Of course, there are many violent crimes committed by cybernetically enhanced, but there is no tangible evidence that one causes the other. 
Nevertheless, the myth of cyberpsychosis persists. There are rumors of a specialized law enforcement divisions devoted to maintaining secret watch lists of heavily enhanced, as well as tracking and neutralizing violent cyberpsychos. In some cultures this issue feeds into social stigma against the cybernetics and the enhanced.

Symptoms

Allegedly, gradual loss of empathy and social connections signals the onset of cyberpsychosis. Victims are rumored to disassociate from family, friends, and lovers; having disrupted sleep patterns; becoming emotionless and cold, forbidding, and purposefully unpleasant to others. So don't be surprised if your ex turns out to be a cyberpsycho after all.

Treatment

Cyberpsychologists (aka psychoshrinks) use the combinations of braindance simulations, drugs, neurotech and aversion therapy. Happy to take your money for any and all of it, and many will tell you that your humanity is about to crack under the weight of all the  cool chrome you just bought.