Has one of your queues stopped sending out your posts?
It's times like this that you may need to re-authorize one or more of your connected SM (Social Media) Profiles.
HOW TO RE-AUTHORIZE SM PROFILES
1. Go to the "Settings" tab and hit on "Accounts"
2. On the left hand side you'll find all your connected SM (Social Media) Profiles.
To re-authorize your SM Profile, hit the "Re-authorize" icon next to the SM Profile you want to re-authorize.
3. Follow the social media prompts (different for each social media platform - see below)
TIP: Make sure you are already signed into the social media account that you want to re-authorize. This makes the whole process easier. In the case of a Facebook Page, you need to be signed in and be an Administrator for that page.