Oh dear, did I truncate the attached log file by accident? I tried scanning through my syslog file to grab only the relevant lines related to Syncthing but I may have done so imprecisely. Would you happen to know what the start of the log typically looks like so that I can search for it? Otherwise I can just post a longer version that contains multiple boots (as it bootloops, I have to start and end someplace). I will try to take more care with the second log which I should have ready within a few hours.
Using the device that is currently disconnected I will then try to start with the apt repo and if the same crashing occurs I will proceed to download from Github, simply because it’s easier to do and I should be able to perform this before the end of the day without issue. Thanks again for the pointers.
Edit: I obtained these from the second log. I nearly missed them (though I spotted it just now thanks to your warning about being truncated) because they were running while a different instance of syncthing was still running (outputting its errors to the log after having crashed).
May 9 12:28:30 servername syncthing[15711]: [V6GRV] INFO: syncthing v0.14.47 "Dysprosium Dragonfly" (go1.10.1 linux-386) deb@build.syncthing.net 2018-04-21 11:42:08 UTC [noupgrade]
May 9 12:28:30 servername syncthing[15711]: [V6GRV] INFO: My ID: [redacted]