Twitter changed the rules
Hello and Good Morning
Twitter is now enforcing a couple of new limitations. It has been already announced in February that the (TOS ) will change to prevent malicious activity. Twitter changes their rules to stop users from posting identical or substantially similar content to multiple accounts or multiple duplicate updates on one account. Twitter's new rules will be valid from 23.03.2018.
What are the limitations and how do they affect us. Before you could post multiple times a day the same content over and over again. Now you are not able to do this anymore if you don't want to risk to be banned.
Means in details many common and effective marketing practices are no longer allowed, even if they rely totally on legitimate Twitter users and legitimate contents.
If you use auto posting services, make sure you cancel them and or adjust them to be a bit different.
Have a great day