In what way?
I'm so sorry, can you elaborate on this question? Which sliders?
Oh yes, it matters. 90 is excellent. If you were at 120 before, that was definitely part of your problem. 120 is always too high.
Oh, good question. Yes, all calibrators fail eventually, although we like to get more than a couple of years out of them. It shouldn't take so long, that's for sure.
To check, you'd need to calibrate another computer with it, and see if it does the same. Do you have another computer in your house?