Please try upgrading to rc.15 and see if there is any improvement. The reason is that even though you haven’t mentioned any logs similar to https://forum.syncthing.net/t/connection-dropped-due-to-decompressing-message-lz4-invalid-source-or-destination-buffer-too-short-and-unmarshalling-message-string-field-contains-invalid-utf-8/24349, that issue would cause such sudden connection drops. The problem is only fixed in rc.15.
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