Hi Sandi,

when your AUDYA freeze - look at EXIT button. "Shines" LED indicator (green) on it? I'v got similar problem, after reboot in one minute Audya freeze like on this video https://uloz.to/live/!zfHue8eSq/ketron-failed-avi

When this happend, maybe I have solution ...
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Nord Stage 2, Ketron SD90, Audya 4+5, SD1000, Roland E-A7, SC8820, Korg microarranger, Alesis Vortex, TC Helicon VL2, Soundcraft Ui12, JBL EON ONE (2), RCF312A