Having the same problem, sustain pedal has erratic behavior in Piano V2 - after latest update.
Pedal works fine and as expected with many other synths (V Collection 7), as well as other brand pianos/samplers/VSTs.
I have had this issue before, and the resulting solution was a new version (repaired) released from Arturia.
Sustain is either not working, works for a bit here and there, then/and/or gets stuck until multiple foot taps releases it. Not positive, but it seems like only certain keys/notes are causing this.