Twitter is behaving weirdly sometimes. I got suspended for the first time the day I joined Twitter after sharing three links — I guess I was seen as a turbospammer. I got suspended twice more shortly about that. Then there was a long period of peace before being suspended for five days or so. Since that everything has been going well.
I guess there are some autoblock mechanisms which in some cases trigger temporal ban. The number of followers, number of posts or time since joining Twitter probably also come into play.
The funny thing I came across waslots of clear spam accounts that managed to last for several days at least. Dozens of accounts sharing hundreds of the same posts as each other didn’t seem to look suspicious to Twitter.