Mine will throw a bad charge if it is not on a stable surface. I keep it on my table just behind the press. I have noticed vibration causing errors. I need to sit it somewhere else but I have found that if I time things just right the problem can be avoided.
Rookie reloader, but learning fast
I load, 9mm Luger, .40, 38 S&W, .38 Special, .357, .45ACP, .45 Colt, .243 and 30-06