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Different cable, plugged straight into the laptop. Been stable for two days. Resolving.

Try without the USB hub if you have one. Mine was a power issue; changing terminal settings didn't help.

The adapter connects fine at 115200 but eventually stops receiving. Unplugging and plugging it back in fixes it for a while. dmesg says "usb disconnect" when it happens. Same result with two different terminal programs. Going to try another…