21:42 [freenode] -!- You are banned from this server- Spam is off topic on freenode. Email email@example.com if in error (2017/8/17 04.42)
I was only in one channel and barely ever said anything, so I'm pretty sure I didn't spam anybody. Some friends of mine also got randomly klined. Upon asking around, I found that Freenode's operators have a reputation for spectacular incompetence, and for mass-klining a bunch of the wrong users in particular.