Just loaded a SNG file from the Hard drive. Had another keyboard midied to it with a patch change on second external synth. Played the top synth, it was fine. Hit a note on the Kronos (for other KRONOS internal sound), and heard a loud, BEEP, like the note was stuck, then it went to the black KRONOS logo screen. It then tried to reboot itself. After it tried, it said system failure, please remove any USB devices and reboot.
Thankfully after shutting it off for 20 seconds and turning it back on, it came back on.

Hope they come up with a permanent fix for this common problem soon. I've only had this thing since February 20th, 2012.
PS. The first thing I did when I got it was update to OS 1.5, so its up to date.
PS2: Settings for SNG. Track 1 is MIDI channel INT (1) (Kronos internal patch); nothing setup for track 2-15. Track 16 is set to MIDI channel (16) EXT2 (063/011), 94 (Triggering a Motif XF patch/voice). There is no song data recorded, it is just a setup for selecting correct patchs/presets for particular song. There us a 16GB USB stik in the USB A port. The song was saved and loaded from the internal SSD drive.
PS3. Serial # 003660
Korg Kronos-61, Korg Triton Le-61, Korg R-3, Alesis Vortex, Edirol PCR-M80, Yamaha Motif XF-61, Roland JV-1080, Roland D-5, E-MU Classic Keys, Kawai Q-80 Sequencer, iPad Pro 9.7, Roland A-49