I got this message:
I tried looking in the logs. Just prior to the channel closing, seems like there was a temporary network issue and the re-establishment message wasn't received by your node. Waited 5 minutes for a reply before our nodes retried (successfully) to re-connect. But I guess by then it was too late, the channel was already closed. What do you logs say?
12:33 Received re-establishment message from remote side for channel 12:38:02 Disconnecting 184.108.40.206:9735, reason: Peer 220.127.116.11:9735 no answer for 5m0s -- disconnecting 12:38:04 Established connection to: 18.104.22.168:9735 12:39 CNCT: Unprompted commitment broadcast for ChannelPoint
Longer log summary 2019-02-13 12:33:01.877 [INF] HSWC: Received re-establishment message from remote side for channel(624919015402f01fd46d6c0d57a3ac23ed33dc411c6f6b395c117867fba0b4fc:0)
==== How can I figure out whats going on?