I also experienced it sometimes but it went to normal later. I thought that posting here is limited that's why it happened.
There was some issue, or maintenance going on. I guess, it's working fine now.
Which server are you connected to? Please check settings page and share with us
Try changing to hapi.ecency.com or other nodes, I believe some nodes are doing maintenance and there seem to be unstability.
I guess it's working fine now, as there was maintenance going on. If it still persists, Ecency's team suggested this server, "hapi.ecency.com".
Once it appears like that, most times the message has delivered.If you don't check,you would be repeating messages.
Sometimes it's the server or network. Happened to me 2 days ago that why I'm just back online since then
