Hi all. Been having this issue for a while. My keyboard will play fine for a while and then 5 keys (the same each time Gsharp to Cnatural) will stop responding. I have had this issue both on a Mac and PC. I have also had the issue with the keyboard started up just connected to power and not connected to a computer. The lights of the 5 keys stay brighter than the others when this issue occurs.
Additionally, something weird happened this evening. I also have a midi piano connected to my mac and today I noticed that when the keys became unresponsive on the S49 the same 5 keys on the piano started to sustain without depressing the sustain pedal. All the other keys on the piano were fine!
Any suggestions very gratefully received!