Can you share more about your setup? Is it a single heroku instance running off a single database backend? All-in-one server?
This could be an issue if you are using multiple NodeBB instances...
Today i installed
nodebb-plugin-facebook @highlighter
https://github.com/highkick05/nodebb-plugin-facebook
nodebb-plugin-poll @Schamper
https://github.com/Schamper/nodebb-plugin-poll
nodebb-plugin-ns-awards @Nicolas
https://github.com/NicolasSiver/nodebb-plugin-ns-points
nodebb-plugin-ns-points @Nicolas
https://github.com/NicolasSiver/nodebb-plugin-ns-points
and now when i post , i have problem with database and freeze site.
IMAGE : http://i.gyazo.com/8fa98afd95aec3a11e81e46d532de8d1.png