JT

I agree. I found moisture on the circuit board underneath the contacts several times. Since I play at least 3 different gigs weekly, changing environments contributed heavily to the condensation, and compressed air didn't really do the trick. So my PX5 has been relegated to rehearsal use only, and I now use a CP4 for gigs.

I am having the same problem on A#5. Not so much the cutoff, but definitely the double-strike upon release at higher velocity. I bought my PX5S used in March 2016 (out of warranty); this problem began in August. Suspecting some dust or foreign object had somehow gotten into the sensor, I took the keyboard apart and completely cleaned the rubber/vinyl contact and the circuit board using compressed air and CRC Electronic Cleaner. The first time I thought I solved the problem, because it was fine for about 2 weeks. (I play full-time in local clubs, and use the PX5S 2-4 times weekly, Yamaha S90ES or CP30 on the rest of the gigs). However, the double-strike returned. I again took apart the keyboard and cleaned the sensors, but this time it did not stop the problem. I suspect the contact may not be seating properly into the circuit board, or it is worn and now responds erratically. Also, the B5 note has begun to stick on occasion. Unless someone has a better idea, when I have time I'll open it up again, and see if I can switch the suspect contact strip with another on the lower part of the keyboard. If I can, and there's any difference, I'll let y'all know and post photos/video.