ZWave keeps going offline after X hours

I’ve returned home tonight and found none of my zwave triggers are working. Having checked PaperUI, I’ve found that my Controller is online, but my items are offline. I run a Pi 3 (Raspbian Stretch) with Aeonlabs Z Stick Gen 2.

I’ve had this before, and updating fixed the problem for a week or so. So I’ve just done the same again (versions listed below). I assume by updating and the fact the issue has returned that I’m probably masking the actual problem.

Unpacking openhab2 (2.2.0~20171126174916-1) over (2.2.0~20171121101624-1) …
Unpacking openhab2-addons (2.2.0~20171126174916-1) over (2.2.0~20171121101624-1) …

When investigating the binding, I’ve found this (Duplicated serial port), might this be a problem? Can this be fixed by editing a file??