My first Servo was psycho -- it hasn't "Run Amok" or anything, it just seems a bit buggy...
Its power drops all the way down occasionally, causing its other motives to bottom out as well. For example, it had full energy so I sent it to repair a broken shower. I left it alone for about a sim hour, then next thing I know its thumbnail is orange and it's going out to recharge. It was nighttime, though, so it had to wait until morning to get its power refilled.
The next sim day, the same thing happened -- only active for several hours then power depletes -- but this time Servo broke. I kept on expecting him to Run Amok or something, but it stood outside for like two sim days without replenishing any power. Then it finally recharged and carried on like normal.
I think it may just be because I had my game on for way too long. I hope the rest of my Servos don't turn out this defective, because as long as it takes to make a Servo even with full mechanical skills and a gold badge, it better be "way overpowered!"