I was casually fixin up my stone generator when out of no where I got banned for 30 minutes, Its not much of a problem but just curios as of why I was banned.
Are you using a fast clock with your stone generator? If you use alot of redstone on your island, which is pushing blocks around, the server may think that you're trying to hack by pushing blocks around faster than it expects, and bans you. This usually happens if your connection to the server isn't great and you're moving quickly or breaking/placing blocks quickly. It can also happen when you're standing on half slabs.
I'm guessing you've been unbanned, so I'll move this to the Help section. But essentially I've listed the reasons why you may've been banned above, and strategies to avoid them.