My pre-Lenovo IBM has been sent in 4 times to fix the same problem. A year ago, I sent it in. They returned it, didn't fix the problem despite replacing the motherboard. I sent it back. They returned it, now not only did they not fix the original problem (they changed the motherboard again, even though that obviously wasn't the issue), but half of the keys on the keyboard didn't work! I sent it in a third time, to their so-called RAID department where an actual PC tech called me to discuss the problem and fixed it appropriately. One year later, it started doing the same thing again, this time I had no problems getting it fixed the first time.
So their general service techs seem to be incompetent, but they do have fast delivery! Turn around time for each problem was maybe 4 days, from when I called them to when I got the laptop back. And it's still a better built laptop than my Dell.