Slack, the widely used business communication tool, experienced slowdowns in service on Tuesday. The slowdown were especially frustrating to workers who have become increasingly dependent on it as their main form of business communication as they work from home. Users complained of slow messages or messages that were not sending starting around 8 a.m. Eastern. At 8:10 a.m., the company apologized and said it was investigating the problem. At round 9:48 a.m., Slack said it appeared that most of the problems had been fixed.
See "Slack Fixes Service Issues ", Maria Cramer, New York Times , September 29, 2020