To avoid potentially restrictive per user, per namespace, per hour ConnectApi rate limits, we migrated orgs to the per org, per 24-hour Salesforce Platform API rate limit. Only method calls that require Chatter are subject to the per user, per namespace, per hour rate limit.
Where: This change applies to Lightning Experience, Salesforce Classic, and all versions of the Salesforce mobile app in all editions in all API versions.
How: If your org is experiencing ConnectApi rate limit issues, contact Salesforce Customer Support.