Someone Has Been Griefing Builder

Almost every time I get on everything in builder is covered in hot_lava and I have to revert to an older version. Is there any way to catch whoever is doing this?

Please put it in report section next time. Also do /b to see information.

I was banned for being AFK! WTF, someone please unban me. My username is "gotvow"

You were banned for griefing.

Wrong sir, I was AFK. When i came back, i was banned!

Right sir you were destroying grass BEFORE we admins have this thing called /b it's /about and we click a block and it tells us who created and who destroyed it.