I was playing with my friend and I got banned for 30 min. It says "The ban hammer has spoken". Ik its only 30 min, but was I autobanned? What happened?

 

The console banned you thinking you were hacking. You did nothing wrong.

 

Just wait out the ban. Apologies if this happens in the future, but adding on to what CoolCreeper said, it happens when lagging or falling or on half blocks