Same thing for me, on Version 1.13.4.5251
I believe been happening since 1.13.0.5023… I get complaints that it’s down, but process is still running. I check localhost:32400 and I get the 503 Service Unavailable error.
Towards the end of the log, all I see is this being repeated:
> Jul 13, 2018 22:37:21.487 [4976] DEBUG - EventSource: Got event [data] '<Message host="snipped" port="443" command="startRelay"/>'
> Jul 13, 2018 22:37:21.487 [4976] DEBUG - Relay: already have an active relay connection for this server
> Jul 13, 2018 22:37:24.140 [1416] DEBUG - Auth: authenticated user 12345 as snipped
