My first Octatrack had this issue. It was ~2 years old when I got it (bought it second-hand). For some reason my unit restarted itself from the slightest shaking or even when I was touching the power chord. The seller offered me to send me a replacement PSU. But I refused & sent it back, since I was pretty positive it’s some kind of an internal problem.

I also made a short video to visualize the problem back then: https://www.youtube.com/watch?v=7eyiQaR_Pbo

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