In my neck of the woods, they generally only go after solos and small firm lawyers for discipline - usually lack of communication with the client, failure to do the job, or mixing client funds with operating funds. Someone I went to law school with got disbarred for activity in another state. Mortgage fraud. Too bad, was probably the 2nd sharpest student in my first year section of about 80 students.
I make sure I communicate frequently (and document it), do the damned job I was hired to do, and be a Boy Scout in regards to money (until the money is official mine - at that point nefarity ensues).
The main extra thing I do to keep my self malpractice proof and discipline proof is to have the client handwrite their objectives when they sign the contract with me. Too many claim to be only interested in the principle of the thing in the beginning, but then change objectives & become more money hungry as they go. I'm fine with a change in objectives, I just want the changes in writing as we go so that it is clear when the changed objectives were communicated to me. Plus, the clients most likely to file a grievance are also the ones most likely to change objectives a lot, so having a well documented stack of changes is beneficial should the dispute-happy client decide to turn on his or her hired gun.