I don't really know how this works, but this is the same/ similar reason I was kicked before. Except this time it told me to report with the code 008 if it was an error. This time I logged on and was lagging (which I read is a general bug), but before I got kicked for flying because I run on a bed. I understand that the 1.12 update made the beds bouncy, so I will try and avoid them- but you might want to add that under flying bugs.
