what are other common causes of lawsuits that you guys have heard of?
The most common cause according to several texts is the suicide of a patient. The second most common cause is abandonment. That is when a doctor drops a patient without a referral and other appropriate actions before termination of services to that patient.
A piece of advice, depending on the state, the definition of what is an appropriate termination of services differs. Make sure you follow your own state's rules. (e.g. some say simply refer the patient to another psychiatrist. Some say give at least 3 referrals, in writing, and documented in a manner that could be reproducible in court.)
The following are things where I don't know the frequency but have some knowledge. While sleeping with patients is a definite no-no, for some reason or another, the states I've seen appear to be more proactive on nabbing non-psychiatric mental health professionals. E.g. my wife who is a counselor had to register with a state service that openly tells patients if their therapist was ever caught sleeping with a patient. No, she wasn't sleeping with a patient, everyone in her profession had to do it. That is not required of psychiatrists. Why? I don't know.
I've never yet seen a case where a doctor was sued because he made his patient into an addict, yet I see that issue going on daily with patients where I've taken over their care from another doctor. I don't specifically bring up to the patient that he/she should sue their previous doctor, but in many of these cases malpractice did occur assuming the patient is telling me the truth. The previous doctor's notes also don't provide any layer of protection. Almost all of them did not document that they discussed the possibility of dependence and addiction.
I've noticed that patients appear to not want to sue a psychiatrist in comparison with other doctors. Why? I'm not sure. I speculated that some of it is the social stigma of mental illness. Another factor is perhaps because the patient will have to bring up very personal issues during the trial concerning their treatment. When people have physical ailments, they are likely more willing to talk about them in comparison with someone who has a psychiatric issue. When someone was raped multiple times and are suing their doctor for malpractice over PTSD treatment, those rapes may have to be brought up in court.