So much for a smooth return to work after the holidays. Your first day back at the office (or your desk at home) might have been disrupted when Slack experienced serious issues on Monday morning. At first, the incident was somewhat limited as messages were not loading for many users. Others were having connection problems. By around 11:20AM ET, Slack was experiencing a full-blown outage, according to its status page.

Slack said “all hands are on deck on our end” as it tries to get to the bottom of the outage, which is far from the company’s first. Slack hasn’t given an estimate of how long it’ll take to resolve the problem, though it will continue to share updates on the status page. In the meantime, perhaps it’s time for another sandwich packed with leftovers.

Update 11:30AM ET: Slack upgraded the problem from an incident to an across-the-board outage.

Update 3:35PM ET: Slack reports “most customers” should be able to connect to the app after the service was down for much of the day (Eastern time). This headline of this post has been updated to reflect this change.