Before troubleshooting or reporting a problem, it&#;s important to check your dmesg log for USB connect and disconnect events to avoid wasting time on the NUT driver when the actual problem is USB. For example, if someone yanks the cable out of the USB port, or if a new USB device is plugged into a USB host/hub that is struggling to power its ports (common on single-board computers like Raspberry Pi), or if you have flaky cabling or EMI noise, the serial converter can get disconnected from USB, at least briefly. This creates a permanent data stale, the driver must be restarted (plugging the USB back won&#;t fix it, since the driver is still using the nonexistent serial device). These USB problems usually have nothing to do with NUT. If it&#;s the case, you should solve the underlying USB problem - check the cable, check the converter, try a powered USB hub, try a full-speed USB isolator, etc.
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