I think I know the reason, why Access has pulled down the 5.1.3.0
I noticed, as lot of users, that all the driver part was going better, but what I didn't notice was for example the aftertouch issues in synth.
I did test and installed back the firmware 5.1.1.0 and then everything works fine. When I update to 5.1.3.0, the in same patches aftertouch will stop working after playing a while (10-20 minutes).
Since I found it during my jamming session (without computer), I think there can be more issues there, if used with Logic or Live.