2413U failed to open serial ports

Five times during the past two weeks my 2413U is not responding in the morning when I first look at it. (Computer is always-on).
In Preferences > Interfaces > Insteon > Configure, a serial port displays. When I click the dropdown by the port, however, the port ID goes away.

Last night's log had:
2017-03-07 07:10:51.800 Power Failure possible power failure
2017-03-07 07:10:55.280 Interface Failure lost connection with interface

Resetting the 2413 doesn't not do anything; hard reset doesn't do anything. The only way I've found to reset it is to turn the computer off, reset the 2413, and turn the computer back on. Can't guarantee that the reset is needed, but that's what I'm doing anyway.

There *might* have been a power failure - not sure - but in any case everything should have reset.

Don't know how to start diagnosing whether this is a software or hardware problem, or what type of software problem it might be. Would prefer not to just dump $80 into a new 2413 if it isn't needed.

Has anyone else had similar issues?

[jay (support)]

If you want to try more diagnostics, then try this the next time it happens:

1. Open a terminal window and type in ls /dev/*usb*
2. Shut down the Indigo Server
3. Unplug the 2413U and wait a couple of minutes
4. Plug the 2412U back in
5. Go back to the terminal window and perform the command above again
6. Start the Indigo Server back up

If after the last step the Insteon interface didn't start up correctly, then paste in the results of the two terminal commands into a reply.

It does sound like the 2413U is failing. You can always get one and replace yours. If there's no difference, then you can return it.

Thanks Jay!