Which firmware is the most reliable???

Hey, I updated my mpc live to 2.1 but it gives me bugs (assigned sample change) and it frustrates me a lot.

When 2.0.5 came out, I updated too but it just doesn't work well and I downgraded to 2.0.3 which the live originally came with.Does anyone have any problems with 2.1 or any version?!? I just wanna hear and talk about what version is the most reliable one......

In my case, errors are

different sample are assigned to pad eg. assigning sound1 to pad1 but after some work (like sample new sounds or browse some samples etc), come back to home, then different sound was assigned to pad1.

range of separated samples changes. (if you separate 1sound into 1~100,101~200,201~300 and assign them onto each pad, it sounds so. but sometimes the range was changed somehow)

Also I feel that response of knob is slightly slower than before...... (firmware related?)