Someone else posted that the USB port on the CEM40 can be a bit loose, and this can manifest in a disconnect during the meridian flip.

I would suggest using tape or double sided hook and loop to pull the USB plug to one side to create sideways tension on the USB cable in the port, preventing it from slipping backwards. It doesn't need to fall out to not connect properly.

I am having a similar disconnect although mine doesn't happen with excessive mount movement, and it isn't a simple disconnect, it takes down the entire Pi USB subsystem. Still trying to figure that one out.

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