Yes. This site is not perfect - it has lots of technical faults.
When your post doesn't go through, you click post again, and it still doesn't go through, so you do it again....
Do it enough and you are automatically banned for overposting, all your posts disappear and you can't sign in.
Within a day or two, hopefully, the error is realised and you are reinstated.,
There is nothing you can do your end, it is down to bad webpage design and writing.



