Prepare yourselves! A reset to everyone's Battlegrounds Rating is coming next week.

Blizzard is light on the details right now, though Dean Ayala did mention a couple of weeks back that this would be occurring with Patch 18.4, so we're getting a patch next week!

Quote From PlayHearthstone

Battlegrounds Rating Reset Incoming

Prepare for a fresh field! Next week, all players' Battlegrounds rating will reset to 0 to make way for a new rating system. More details coming soon