Haven't had a calibration problem yet, maybe that's because I don't keep the wheel plugged in all the time, only when I decide to play.
What comes to other problems, shifting to fifth sometimes causes random choice between third and fifth gear, shifting to sixth feels a bit sluggish but has worked so far. Steering to the left makes louder noise than to the right, luckily I have decent closed headphones to counter it with louder volume. All this after only a month of little use (occasional 2-4 hours of racing), good quality control logitech.