syncthing connects, fails to sync and then disconnects

What’s the syntax/behaviour for that? ./syncthing -STR… gives me an error and the help page and ./snycthing STR… also get me the help page, but no error. Do I simply set it, and then run it again? If so, here’s the output, but doesn’t seem like much changed:

[SG***] 08:44:19 INFO: Detected 0 NAT devices
[SG***] 08:44:21 INFO: Established secure connection to FBP*** at 10.***:22067 (relay-client) (TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305)
[SG***] 08:44:21 INFO: Device FBP*** client is "syncthing v0.14.40" named "14-***"
[SG***] 08:44:23 INFO: Joined relay relay://163.***:22067
[SG***] 08:46:51 INFO: Connection to FBP*** closed: read timeout
[SG***] 08:48:08 INFO: Established secure connection to FBP*** at 10.***:22067 (relay-client) (TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305)
[SG***] 08:48:08 INFO: Device FBP*** client is "syncthing v0.14.40" named "14-***"
[SG***] 08:48:19 INFO: Connected to already connected device (FBP***)
[SGCIO] 08:50:38 INFO: Connection to FB*** closed: read timeout

and so on, on both devices. The port :22067 is also reported by the windows machine for the linux one.

However, I left my office PC (windows, wired connection) running over the weekend, and my linux laptop was used quite a bit on my home wifi and now I am on “syncing, 97%” on that one, and on 60% on the windows machine, where I also was greeted with a message on the web UI that my laptop wants to share a folder with it. I have since allowed this sharing, but I’m stuck at 0B/s syncing speed.

So maybe it is a similar issue to this: Syncthing v0.14.38, sender sync stuck at 0%, reciever folder "Up To Date" when it's not [SOLVED] ?

Any ideas how to test that? As said, a speedtest for the wifi is quite good, but the wifi occasionally has some issues (e.g. when streaming HD content) and I see a dozen other networks here, so I would not be surprised if there is some “congestion”. However, I can’t access the router to get it’s logs or switch frequencies, since this is not my network. It’s a university network (eduroam) which is also used for the students, whereas my wired connection is a staff connection, so I would not be surprised if some things are blocked on wifi, but I have never encountered an issue and I am not aware of any “they’ll expulse you if you torrent” scares among the students.

REgarding the v0.14.40 fails to connect - #20 by imsodin issue: Seems to me like this is a different issue from mine.